Vraska the Unseen is a mythic Legendary Planeswalker — Vraska card from Return to Ravnica (RTR), collector number 208. Current market price: $1.01 (foil $7.73), TCGplayer market prices via Scryfall.
+1: Until your next turn, whenever a creature deals combat damage to Vraska, destroy that creature. −3: Destroy target nonland permanent. −7: Create three 1/1 black Assassin creature tokens with "Whenever this token deals combat damage to a player, that player loses the game."