Liliana of the Dark Realms is a mythic Legendary Planeswalker — Liliana card from Bloomburrow Commander (BLC), collector number 78. Current market price: $20.82 (foil $24.32), TCGplayer market prices via Scryfall.
+1: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle. −3: Target creature gets +X/+X or -X/-X until end of turn, where X is the number of Swamps you control. −6: You get an emblem with "Swamps you control have '{T}: Add {B}{B}{B}{B}.'"