Nessian Game Warden is a uncommon Creature — Beast card from Journey into Nyx (JOU), collector number 132. Current market price: $0.08 (foil $0.36), TCGplayer market prices via Scryfall.
When this creature enters, look at the top X cards of your library, where X is the number of Forests you control. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.