Xira, the Ancient

Summoning (If this card is your chosen summoning
you may start the game with it in exile. When this creature enters the battlefield, exile it if it wasn't
summoned. You may only summon once per game.)
Trample, Menace
At the beginning of combat on your turn, your opponent may choose one nonland permanent they control. If they do, you gain control of that
permanent and Xira can't attack this turn.