Yuri, Savage Mockingbird

Eminence — Whenever you attack with one or more Knights, if Yuri, Savage Mockingbird is in the command zone or on the battlefield, draw a card, then discard a card.

Flying, First Strike

Whenever Yuri deals combat damage to a player, return target Knight creature card from your graveyard to the battlefield.

"Nothing and nobody can shackle me. A caged bird never sings."