Mordekaiser is an all round amazing champion, he excels at pushing, farming, applying lane pressure and helping by ganking. People may think that Mordekaiser is not strong anymore because of the new meta in Season 3, don't listen to them, they're stupid. Mordekaiser is as strong as he's always been, the effectiveness of having a Mordekaiser on your team and the satisfaction of gaining their Carries ghost is second to none.

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By the way, if you wanna add me on LoL I play in the NA servers. Summoner Name: Gvr97.
If you ever want to private message me i'll be happy to help.

Pro's

Super Farming Potential
Late game hyper-carry
Destroys most AP Carries
Manaless :D
Shield = 2 bars of HP.
SUPER DAMAGE HUE HUE HUE

Con's

Bad early game
No early sustain
Moves based off HP
Weak against DoT

I suggest taking Magic Penetration marks because no matter whom you're against, you're gonna be winning in the early/mid stages because you're Mordekaiser. Something which is overlooked a lot in League of Legends is that people have natural armor and magic resist, just because someone isn't buying Thornmail or Frozen Heart doesn't mean that you don't need penetration, they'll always have base armor and magic resist.

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Taking HP/Level seals is something that I realized was best after many, many Mordekaiser games. In the early stages, it's imperative to let your laning enemy know who controls the things in the lane, having hp allows you to spam without having to worry too much about hp.

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I take FLAT AP Quintessences for super lane damage, remember that the more damage dealt; the bigger the shield. Having your shield up at all times is important as so you don't take unnecessary damage. MAKE SURE YOU HIT MINIONS TO GAIN SHIELD!

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The AP/Level Glyphs are important because just your sole 4.95 AP from the Quintessences aren't enough, they won't provide into late game, for maximized late game damage, combine this with your 15 AP from Quintessences, 0.17/Level Glyphs and your major items and you're certain to be Legendary.

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AP and Health per level are for the early game stages, where if you harass, you maximize the shield and damage output. This method won't render you useless if you spam skills to zone the enemy.

This is the basic skill sequence you want to go for, it focuses in maxing Siphon of Destruction for high AP nuke damage being the most bursty you could possibly be while maxing Creeping Death second for the farming plus extra Resistance .
This set combination is the same as Gambit Gaming's Alex Ich (Moscow 5) uses while he plays this champion.

If you're up against a harder mid such as Kha'Zix or Zed. You might be willing to take all skills at level 3. This will help for when they make engages on you and will also be a good way for farming against them.
Iron Man is Mordekaiser's super I-Destroy-Everything passive. Not many people understand it but it's the main reason Mordekaiser is so tanky without having to build tank and is able to facetank a team. Iron Man works off all Mordekaisers other moves. Mace of Spades, Creeping Death, Siphon of Destruction and Children of the Grave. 35% of the damage dealt with any of these moves will be transferred into the shield, (17.5% on minions). you'd want to start harassing when your shield reaches about 50%-60% so that you can trade with no damage taken.

Mace of Spades is Mordekaisers major single target move, it specialises in utterly destroying a single target and is a great move to take at level 4 for AP ranged champions, or at level 3 for Assassin mids and bruiser tops. Mordekaiser should be maxing this last out of all his moveset because as AP Mordekaiser this move is hard to use correctly, it requires you to be in the opponent champions face and could cause you a major loss in your lane if you try harass with it. It's a great farming tool for early levels to last hit with but other than that, you shouldn't be putting more than 1 early point into it.

Creeping Death is your main utility move, it supplies both resistances (level 1 = 10, level 5 = 30) to an allied minion, champion or pet. It's an amazing harass, you can place it on a minion to farm and it's awesome for 1v1ing with those resistances to help you out. IT'S A GREAT KS'ING SKILL TOO ;).

Siphon of Destruction the absolute greatest harass in League of Legends, the move is broken. It's a cone ability which hits further than it's supposed to, it's damage is immense and it allows Mordekaiser to kill more and more. Siphon of Destruction is by far the greatest move on Mordekaiser and no one would think twice about maxing it by level 9.

Children of the Grave is one of my top 3 favourite ultimates in League of Legends. Mordekaisers ultimate has 3 stages. Stage 1: Mordekaisers ultimate deals (12%/14.5%/17%) of the targets MAXIMUM health in magic damage, that's a lot of damage. Stage 2: Mordekaisers ultimate deals (1.2%/1.45%/1.7%) of the targets MAXIMUM health every second for 10 SECONDS, that's crazy damage over time. Stage 3: If the enemy is KILLED (Not killed a bit then revived by GA or Zilean) then Mordekaiser gains 20% of that champions AP and AD and Mordekaiser gains the ghost of that champion for 30 seconds, 75% of his AP and AD are transferred to his ghost and he can use it as he pleases.

(To aim Mordekaisers ghost, you HOLD ALT and right click or HOLD 'R' and right click.)

Who To Aim.
This is very important. There are 3 types of people you should be aiming with your ultimate to use it to its maximum potential.
Type 1: The AP Caster. These are the people who have no real use for you apart for the huge buff in AP.
Type 2: The Tank. Tanks come in different forms, sizes and species. Let's take Maokai and Dr. Mundo for instance. Maokai is a great tank, although he's not one which you should be aiming too much. He relies on spells like his ult to make his team tankier. Dr. Mundo on the other hand is a straight flat meatshield who devours anything that comes at him. Since Mordekaisers ult does hp based damage, this would be your second best option.
Finally type 3: The Carries. Carries should be focused 80% of the time, no matter what kind of carry it is. If they have good AD, you want them. Carries come in many types, there's Ranged based carries like Tristana and Kog'Maw and there's Melee based carries like Master Yi and Tryndamere. In the new META it's suggested that you mostly focus down the ranged based carries as they do more damage and are harder to get to, but really you should get whoever is most fed because if you do, you aim them down quicker than anyone else.

Now. Who NOT to aim with your ult.
Zilean or anyone with his ult. Even if you kill the person, you don't gain the ghost.

Anyone with Guardian Angel, try at least get it down first. Otherwise it'll be the same case as Zilean.

Nocturne with his Shroud of Darkness. It will completely negate the ult, rendering it useless.

Sivir with her Spell Shield. Same as Nocturne.

Anyone with High Magic Resist. Singed BEING A MAJOR ONE. You won't do enough to them.

Anyone with Quicksilver Sash or Mercurial Scimitar BIG NO-NO'S, they can remove the effect of your ultimate's DoT.

Finally anyone with a Clone. Such as Wukong and his Warrior Trickster, LeBlanc and her Mirror Image and Shaco with his Hallucinate.

Flash is an amazing choice for Mordekaiser as it provides that major gap close/escape which his skill set doesn't provide. A Numero Uno choice for all Mordekaiser players.

Ignite, don't you hate it when an enemy gets away with the slightest amount of HP? WELL NO MORE. With Ignite your problems will go far away, a high damage DoT which deals true damage. It also works perfectly with Children of the Grave for super DoT.

Clarity pls dun do dat. u get reported and pepul tink u troll. :3

Ghost provides a 35% speed boost (27% without the mastery.) to the user for 10 seconds, which in fact is a massive boost for Mordekaiser. The speed boost is able to get him in and out of a quick kill situation without much damage taken, it's perfect. ALTHOUGH. Ghost is unable to handle the major escape situations. it takes too long to travel the distance Flash may be able to cover.

Teleport is a summoner spell to be used under certain circumstances. If you're up against a Swain or Brand or anyone who you think will be able to bully/poke you out of lane and is disrupting your farming too much, then Teleport is the perfect option. It can also be used to perform ganks secretly upon other lanes for quick snowball potential.

Exhaust isn't really the best choice unless you have an AD Carry in mid lane or are up against someone with channeling moves which will destroy you like Nunu & Willump's Absolute Zero and Morgana's Soul Shackles or you have a Bruiser Carry Jungler like Vi or Xin Zhao.

Try to rush your Sorcerer's Shoes just before you get your Seeker's Armguard, it's amazing to see the amount of extra harass and ability to farm that gives you. As soon as you have a Sorcerer's Shoes -> Seeker's Armguard -> Hextech Revolver combo, you may see a lot of the enemy team Q_Q, this is because now you're overpowered and should be able to W -> E -> Q a minion wave and it'll disappear. Aim to burst down high priorities, with items that give you great amounts of AP and good defensive stats, you're going to see a lot of kills and minimal deaths. You really have the choice for your last item, Get Abyssal Mask first if they're heavy AP teams or Liandry's Torment if you think their team has too much Magic Resist. With Liandry's Torment being insanely strong at this point in game, why wouldn't you get is as early as possible?

Ok, I'm going to explain the biggest counters for Mordekaiser and how to counter the counterpick.

Cassiopeia - Many people believe a Cassiopeia vs Mordekaiser lane is a goner for Mordekaiser, this isn't necessarily true. Mordekaiser with early Sorcerer's Shoes should be enough for you to dodge Cassiopeia's most vital source of damage, the poison. If you manage to dodge her poison, her Twin Fang will be forced upon cooldown, that's a vital part of Cassiopeia's burst. During laning phase, keep your distance and use your W on a minion and E to farm, getting too close to a Cassiopeia in early stages is dangerous, as soon as you reach level 9, your e's burst/poke exceeds much of her damage, so make engages only once you know her Twin Fang is on cooldown and you're post level 9.

Yorick - Attempt to use his ghouls to your advantage, if you're able to use your Siphon of Destruction to hit his ghouls and Yorick, your shield will already be too high for him to make any serious engages. In short, don't allow him to get free poke off you, make sure you use your Iron Man (passive) to it's greatest effect.

Brand - Brand may have damage overtime, although his Sear is very iffy, if he misses his stun, he's forced to back off his engage or else he's vulnerable to a lot of damage. Brand is very squishy but his burst is enough to counteract that loss, if he lands his stun, it's an almost guaranteed burst death for you.

Malzahar - MOVE, avoid his Call of the Void silences and you're free to engage. Make sure you're able to push the lane harder than he can pre-level 6, if you can do that much, he'll find it hard to counter push and he'll have trouble taking the lane. Don't attempt to fight or auto attack minions once Malzahar has his Malefic Visions on a minion, that's basically allowing him to engage onto you. Play it carefully once he's level 6, Mordekaiser's biggest weakness is the inability to move or cast, as soon as you're unable to cast spells, you cannot gain a shield and become vulnerable to death.

When it comes to farming, make sure you can pick up early last hits with auto attacks, don't start spamming level 1, it'll hurt you. When you reach the 15 Min mark, try to have at least 130 cs, with this your lane will be a piece of cake. When you push to the enemy tower, take your wraiths, push to tower again, take wolves. This method is a way of farming that, even if the lane is doing well against you, you're sure to have the advantage (Just make sure to tell your Jungler you'll be taking his stuff, he'll get mad if you don't :3) Just know, that when you have your Sorcerer's Shoes, Seeker's Armguard and Hextech Revolver, you can W -> E -> Q and minions will die to your awesomeness.

Mordekaiser needs no team. He literally just needs an enemy and it's a win.

In all seriousness, in a team fight try to prioritize using Children of the Grave and removing the enemy AD Carry (or if someone's fed, them) to rid of them. Once you have retrieved them, use them to auto attack/ Tank and win the fight.

Mordekaiser can be positioned 2 ways in a team fight.
1. Balls-deep in the middle of the fight, take damage but have your shield soak most of it up, this is for the teams which have hardly any cc or teams which are not willing to cc you.
2. You play it carefully, wait for the right moment while poking their team down. Once your team engages, you're free to jump on their carry and if your team has common sense, they'll do the same.

You're free to play out the fight as soon as you have their carry, position it (click 'R' and right click or 'Alt' and right click) and place them in a place that they're easily seen, this'll take focus off you and put you in a position where you're able to dish out more damage while keeping distance.

In early stages, when ganking or getting a gank, make sure you Scout for wards and ward your lane, your jungle will hate you if you try asking for a gank and the enemy has a ward.
Play Video /league-of-legends/champion/mordekaiser-46

All in all, Mordekaiser is a one man team based off carrying brain dead idiots through elo hell, if you are able to play Mordekaiser and your team follows up with you, you're granted a certain victory. (this only applies if you use my build ;3)