Garruk's Warsteed is a rare Creature — Rhino card from Core Set 2021 (M21), collector number 337. Current market price: $0.23, TCGplayer market prices via Scryfall.
Vigilance When this creature enters, you may search your library and/or graveyard for a card named Garruk, Savage Herald, reveal it, and put it into your hand. If you search your library this way, shuffle.