Wreck Hunter is a rare Creature — Human Artificer card from Magic Online Promos (PRM), collector number 105686.
Flash When this creature enters, choose target player. You create a tapped Powerstone token for each nonland card in that player's graveyard that was put there from the battlefield this turn. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")