Rainveil Rejuvenator is a uncommon Creature — Elephant Druid card from Tarkir: Dragonstorm (TDM), collector number 152. Current market price: $0.28 (foil $0.28), TCGplayer market prices via Scryfall.
When this creature enters, you may mill three cards. (You may put the top three cards of your library into your graveyard.) {T}: Add an amount of {G} equal to this creature's power.