Gamekeeper is a uncommon Creature — Elf card from Dominaria Remastered (DMR), collector number 162. Current market price: $0.30 (foil $0.19), TCGplayer market prices via Scryfall.
When this creature dies, you may exile it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and put all other cards revealed this way into your graveyard.