Silverback Elder is a mythic Creature — Ape Shaman card from Dominaria United Promos (PDMU), collector number 177p. Current market price: $8.14 (foil $10.09), TCGplayer market prices via Scryfall.
Whenever you cast a creature spell, choose one — • Destroy target artifact or enchantment. • Look at the top five cards of your library. You may put a land card from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order. • You gain 4 life.