Muldrotha, the Gravetide is a mythic Legendary Creature — Elemental Avatar card from Foundations (FDN), collector number 243. Current market price: $0.74 (foil $2.19), 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.)