Gamekeeper is a uncommon Creature — Elf card from Conspiracy (CNS), collector number 165. Current market price: $0.21 (foil $2.02), 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.