Mirov, Crown of the Forgotten

Whenever a nontoken creature enters the battlefield under an opponent’s control, you may
pay {1}. If you do, that player creates a 3/3 green
Elk creature token, and you gain control of their creature until end of turn. Untap it. It gains haste. Activate only once per turn.

At the beginning of your end step, if you control a creature you don’t own, you may exile it. If you do, draw a card and create a Food token.