Vraska the Unseen
Return to Ravnica — Mythic
Planeswalker — Vraska
+1: Until your next turn, whenever a creature deals combat damage to Vraska the Unseen, destroy that creature.
-3: Destroy target nonland permanent.
-7: Create three 1/1 black Assassin creature tokens with "Whenever this creature deals combat damage to a player, that player loses the game."