Garruk's Harbinger is a rare Creature — Beast card from Core Set 2021 (M21), collector number 307. Current market price: $0.18 (foil $0.27), TCGplayer market prices via Scryfall.
Hexproof from black Whenever this creature deals combat damage to a player or planeswalker, look at that many cards from the top of your library. You may reveal a creature card or Garruk planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.