Edelgard, Scion of Change

+1: Creatures you control gain +3/+3 and haste if an opponent has more life than you this turn.
-3: Destroy target creature or planeswalker you don't control. Edelgard gains all the abilities of target card on top of its other abilities.
-10: Create an emblem with "If a creature enters the battlefield under an opponent's control, it is sacrificed unless its controller mills 10 cards.