Xin Zhao

He will constantly invade you and try to 1v1 you as he will win 100%. Stay off and get red form asap.

Jax

You can kill him whenever you get Rhaast and you got R to dodge his stun. Dont fight him early game and dont fight him late game as Shadow Assassin.

Kha'Zix

Skill Match up, try to R him before he goes invisible with R. He usually has more dmg than you no matter which form you go.

Lee Sin

Skill matchup. Don't fight him early game.

Fiddlesticks

Dont fight him early game and try not go get ulted in teamfights, he will silence you and kill you easily.

Ekko

I hate this guy, ban him. You can win 1v1 if Rhaast and with Visage, if you miss your W you're out.

Master Yi

He is Master Yi. If he gets fed go Thornmail, red smite and time your W.

Amumu

Rhaast wins 1v1 late game. He is more useful in teamfights and Skirmish.

Dr. Mundo

Go Mortal Reminder.

Elise

Dodge coccoon and you win.

Kindred

Annyoing as denies your oneshot with her R but you can win if you time well your R.

Evelynn

Be careful with her. Try to invade pre 6 before she gets her invisibility.

Olaf

He abuses conqueror more than you, try not to fight him.

Udyr

Rhaast deals easily with him

Vi

She is stronger early game

Camille

You can 1v1 her but beware her stun.

He won't be a problem himself. Try to secure drakes and herald. And keep up with him as he will try to spam ganks to get midlane or botlane fed.

Karthus

He has a ton of dmg, try to stop him getting your form quickly.

Sejuani

Easy Rhaast matchup

Zac

Just annoying. Beware his jump-stealing objectives technique.

Malphite

Care his full ap build

Jarvan IV

Skill matchup, land your W and you got him.

Volibear

Shaco

Annoying as hell. Go oracle and try not to ult the clone.