Muldrotha, the Gravetide is a mythic Legendary Creature — Elemental Avatar card from Dominaria Promos (PDOM), collector number 199s. Current market price: — (foil $12.06), TCGplayer market prices via Scryfall.
During each of your turns, you may play a land and cast a permanent spell of each permanent type from your graveyard. (If a card has multiple permanent types, choose one as you play it.)