Tomb Robber is a rare Creature — Human Pirate card from Rivals of Ixalan Promos (PRIX), collector number 87s. Current market price: — (foil $0.74), TCGplayer market prices via Scryfall.
Menace {1}, Discard a card: This creature explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)