Outcaster Greenblade is a uncommon Creature — Human Mercenary card from Outlaws of Thunder Junction (OTJ), collector number 172. Current market price: $0.24 (foil $0.24), TCGplayer market prices via Scryfall.
When this creature enters, search your library for a basic land card or a Desert card, reveal it, put it into your hand, then shuffle. This creature gets +1/+1 for each Desert you control.