Hammer Helper is a common Sorcery card from Unstable (UST), collector number 85. Current market price: $0.10 (foil $0.41), TCGplayer market prices via Scryfall.
Gain control of target creature until end of turn. Untap that creature and roll a six-sided die. Until end of turn, it gains haste and gets +X/+0, where X is the result.