Sibling Rivalry is a common Sorcery card from The Brothers' War (BRO), collector number 152. Current market price: $0.22 (foil $0.17), TCGplayer market prices via Scryfall.
Gain control of target artifact or creature until end of turn. Untap it. It gains haste until end of turn. Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")