Liliana, Waker of the Dead is a mythic Legendary Planeswalker — Liliana card from Core Set 2021 (M21), collector number 297. Current market price: $3.41 (foil $3.71), TCGplayer market prices via Scryfall.
+1: Each player discards a card. Each opponent who can't loses 3 life. −3: Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard. −7: You get an emblem with "At the beginning of combat on your turn, put target creature card from a graveyard onto the battlefield under your control. It gains haste."