Hey everyone my name is Serene Swan and I have struggled in bronze/low silver elo season 3.
I remember one champ that consistently carried me out of low elo to gold/plat which was Mordekaiser.
His kit allows you to make a team fight 6v4 in your favor.
Mordekaiser also has crazy wave clear and can push very quickly and create tons of map pressure which leads to free drags and barons.

your beginning purchase should be a dorans shield and a pot generally but the purchase varies depending on the opponent.
If the other mid laner has a sustain lane boots 4 pots isnt too bad either

The runes aren't special just 3 flat ap quints for the early game damage
scaling health as you are going ap mid and not going tank so you need some survivablity later in team fights.
Mr And Armor defense runes are standard for any champion

The masteries arent special in which I just went 21/9/0 standard AP masteries

Mordekaiser excels at low elo such as bronze or silver but once you get to plat he becomes harder to play because CC is his main weakness and if the enemy CCs morde he is in trouble.
Also enemy ad carries wont be exposed and standing for you to ult even in your flash range.

AS the game progresses you should have more farm than your enemy mid laner
Once teamfights start you use your W on the tank or person who is going in to build up your passive than when you see a squishy exposed ( if they arent in range and you are sure your team wont lose the fight you can flash in and blow the combo in which you go E ignite ult Q (blow everything on them)
you should kill him/her easily then voila you got a ghost.

Mordekaiser excels in farming in which he uses no mana has sustain with spell vamp and he can push real easily because he can use E whenever it is up and it is AOE.