Irelia is currently being banned in your games or destroying your team. If you’ve missed it here’s all the ridiculousness she can do now.
When playing Irelia the name of the game is still resets and now it just got a little more anime like. Now you need to mark enemies to get a free dash or kill minions/champions within a second of dashing to get the reset.
There’s a lot more there and mastering her is going to take some time. Right now she’s overpowered simply due to ignorance so take advantage of it while you can.