Anivia

Good anivias are painful to deal with. Your Crash Down is easy to predict and interrupt. Anivia can only defend herself to 1 side really well. She sucks against flanks. Try engaging from creative angles, or from out of vision. You will need your flash.

Ashe

ADC is Ashe is less annoying than Supp Ashe. Dont let her poke you with W.
Go Glacial Augment, Hexflash and in secondary tree either Unflinching or Nimbus Cloak with Celerity if you could kill if you are able to reach.
Consider buying Boots of Swiftness.

Alistar

A classic matchup. Bad Alistars are easy to deal with, good Alistars are even to hard. Do not be the one engaging. Counterengage onto the ADC, but only if he can follow up.

Bard

Depends a lot on how good Bard is, Try killing him lvl 1/2/3, because he outscales you. Usually you cannot match his roams, and are stuck on bot while he makes your midlaner ragequit. If he decides to permaroam and you cant punish the enemy ADC 2v1, you have no choice but to try match his roams.

Blitzcrank

You dont really mind getting hooked by Blitz, but I recommend running Aftershock.
Remember he can cheese your team level 1 and ward safely. Maybe stack- your level 1 Crash down onto 5 is strong.

Braum

Aphelios

Easy. Care for Red-White or when he is about to swap weapons though.

Brand

Go an MR rune and Second Wind if you can. Try dodging his spells while you sprint at him. If you reach him without eating his W or Q, he is dead.
If you are not careful he can 1shot you, so be patient.

Caitlyn

She is similar to Ashe, just that instead of poke she has push. Wait for ganks and always play with brush.

Draven

Both, Glacial and Aftershock are good against him. While Mounting Up, try dodging or flashing his Step Aside. If you manage that, even Draven is an easy kill.

Ezreal

You have trouble getting into Ezreals range. Dont ever use W Crash down on him, but always try going for Mount up. If he has Yuumi the lane is hard. Must go Hexflash. Stand in brushes and dodge/soak some of his Mystic Shots, so he loses passive.

Galio

The colossus looks like an ant next to Rell. You can tank his combo and win the all-in.

Gragas

Gragas is a bit annoying. Rell is super reliant on having followup. Gragas can just completely scatter your follow up, and in the worst case: cancel your Crash Down. Try engaging creatively. You can punish him if he uses his spells on lane, since he has long cooldowns on Q and E.

Gwen

Rell is a hidden counter against Gwen, as you can assist your frontliners against her and stunlock her dead.

Janna

This matchup is horrible. You can only engage pre 6, and if she misses tornado. Try taking your shots then. Consider going Chemtank and Nimbus Cloak build.

Heimerdinger

As soon as he misses his granade or W, run him down. Consider running an MR rune.

Jhin

Easy before he has his Boots of Swiftness, then hard. He runs Galeforce so he can easily dodge your engage later on, remember that. Try killing him in lane.

Jinx

She is weak early. As long as you can burst her, its fine. Be aware of Lethal Tempo: she will look for trade kills if you dont focus her.

Kai'Sa

She is low range, so it is easy to engage her. You are also very good against her ultimate. Remember if you plan on using Crash down onto her: she could ult away to another target. Use mount up if possible.

Kalista

Especially with Glacial Augment this matchup is fine. Kalista hates CC and you are walking CC. Most Kalistas are bad.

Karma

You lose extended trades, she is squishy so as long as you are able to burst her you are fine. Remember to ignite early to reduce her Matra W healing.

Kog'Maw

This matchup isnt easy. He runs lethal tempo and will probably get return kills if you dont burst him. He will mega outscale you so try punishing him in laning phase.

Leona

You are just good against her. Go Aftershock. Later on if she engages look to counterengage onto her team's followup.

Lucian

He wants to play forwards, so he runs into your arms. Many Lucians build Galeforce so keep that in mind. In early game you can always engage on him and win because you can soak his burst, don't get too cocky, just know you would win on even terms.

Lulu

She deals more damage than expected. Also she can interrupt your engage with R and W. In early she is very very squishy though. Later she is a problem.

Lux

Run at her with W, flash over binding. She flashes. Play Hexflash. She misses 1 binding = she is dead.

Miss Fortune

Her slow/poke is obnoxious. You have a hard time catching up to her due to her W. Dont underestimate her ult damage. Try surprising her.

Maokai

Rare matchup. If he goes AP stay away from brushes but just flash on him and kill him. If he plays tank you can tank his saplings in brush and zone him off. You win fight.
He is annoying and special to play around though.
Disengage when he ults, then counterengage.

Morgana

Mega cancer. On the bright side: she picked bad champion. On the not so bright side: you do not have fun. Run Tenacity, try mindgaming her to use Black Shield and switch focus on other target. It is playable if Morg isnt very good but if is you cannot play the game.

Nami

She only has a few okay combos, but if she and her partner overstept, make sure to quick flash on her and send her to sky.

Nautilus

If Nautilus goes Aftershock matchup is even, if not it is easy.
Only engage if you can burst enemy ADC low. Let him engage use E as hook hits you, break shield and kite back or counter on ADC. Be careful not to overcommit though, because it is hard for ADC to walk past Nautilus. Never run in without followup.

Neeko

Flash snare, burst her. dead.
Break her shield on ult if you are ultimate troll.

Poppy

Dont ever crash down on her. Let her engage and wait out her W while fighting her.

Pyke

skip boots and go Ruby+Cloth.
go 1 or 2 armor runes.
go bone plating.
be dismounted and play patient, if he uses his E you have opportunity to counterengage.

Rakan

You are good vs Rakan.
Just Mount Up run at him any time you like as long as there is followup.
Very good Rakans make the matchup even.

Renata Glasc

A bit hard because she can ult your followup, slow you, and drag you out of engage. Also if you burst somebody they can get revived. I think when Renata players become better the matchup will be very hard.

Samira

Hold Q Shieldbreak for her Shieldbow.
Hold E for her Ult.

Senna

She is very squishy and sucks against engage and CC, but has a lot of annoying combos.
Try dodging her W.

Seraphine

Theoretically you should be good against this champion, but riot likes her too much so she is always op.
Once she gets nerfed this matchup will be okay, for now its bad and I always ban Seraphine.
Support Seraphine is less problem than Botlaner Seraphine.

Sejuani

Dont be the one who engages. Be patient and counterengage onto her followup.

Shaco

Very annoying to lane against. You should play red sweeper already, but now you MUST.
On the bright side: the enemy team has shaco.
Just dont engage and sleep out the matchup. Sometimes Shaco players make mistakes when they get as bored as you and use their Q. Then is your time to punish, especially if he plays without Flash.

Shen

You can break hit Ult.
Try avoid getting hit by his Q, but you should win, you are better champion.

Sivir

You can Run at her play Glacial+Hexflash+Nimbus and use E insta after she shields your W. She can only shield 1 of your 2 CC spells.

Sona

Be a bit patient for when she makes a wrong step and flash on her as soon as she does. Free +300.

Soraka

She plays the better champion and if she uses silence field under herself, its hard to play, just disengage then.
Most Soraka players do not have a brain though so just flash her QE and burst her.

Swain

Easy early, medium-hard later.
Nothing special here.

Tahm Kench

Break his shield and he is sad. Max Q second.
Try dodging his Tongue and dive in fights

Taric

Rare Matchup, but Taric should be very strong against Rell. Either surprise in teamfights and be faster than him, or be patient and wait out his R.

Thresh

He can keep you at distance on lane, but as soon as in teamfights you flash ult surprise them, there is nothing he can do.

Tristana

Play aftershock.
As long as you play dismounted default you cannot lose if she jumps on you. Just make sure to focus her and try catch her burst from E with aftershock if she is dumb enough to use it on you. If she does you autowin.

Twitch

He is op at the moment, but if you have strong early ADC you can burst him. If he goes Lethal Tempo its harder to play because of threat from return kill if you dont burst him.
You can lock him down easily with some coordination/followup of team, but without it can be hard.

Varus

You win early 4 levels easily, but if he goes good builds and hits R he can be hard after his first item.

Vayne

Its hard to find an opening against her in any stage of the game. Your best shot is early 2 levels.
Try waiting out her Stealth Tumble when you turn on her in teamfights.

Vel'Koz

Run at it. Flash over spell and burst.
Glacial is good.

Xayah

You just instantly deny her plans of kiting back when you engage her and she has troubles lining up feathers. Its quite easy, even with Rakan on her side.
Glacial makes her line-ups even harder.

Yasuo

I love picking Rell into Yasuo.
He wants to cheese level 2 fight, you just win if you peel for adc properly. Care of his Lethal Tempo though.

Yuumi

Be confident.
If engage wasnt underpowered and yuumi a bit overpowered this would be easiest matchup.
Try making her think you want to run away but flash on her with mount up as soon as she W out of host. Yuumi was a mistake and you should make her feel it.
Ezreal + Yuumi matchup is a bit hard because you have trouble reaching them, maybe try Chemtank or Nimbus Cloak.
Against Twitch Yuumi be very careful that you engage only if followup is there. If not it can be catastrophic because Twitch Yuumi snowballs like nothing else in the game.

Zeri

She might be op at the moment, but she is bad early game, you are strong early game.
Dodge her W poke. Sprint at her with Mount up and she can do little.
Later she massively outranges and outscales you so make sure to gain advantages early.

Zilean

If Zilean is good you are in big trouble. Zilean is hidden op since ages and hidden counter vs Rell because nobody plays Rell nor Zilean. There is nothing you can against him as soon as he gets through early 5 levels without deaths. Luckily Zilean players are often bad and underestimate Rell. Try send him sky early or dodge.

Zyra

Flash her root and 1shot her.