Junkyard Genius is a uncommon Creature — Human Artificer card from The List (PLST), collector number BRO-214. Current market price: $0.06, TCGplayer market prices via Scryfall.
When this creature enters, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") {1}{B}{R}, Sacrifice another creature or artifact: Until end of turn, other creatures you control get +1/+0 and gain menace and haste.