Your search for "strength-testing hammer 479" revealed the following:
Strength-Testing Hammer (Galaxy Foil) (UNF) from Unfinity, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Gaboleps Card Text:Whenever equipped creature attacks, roll a six-sided die. That creature gets +X/+0 until end of turn, where X is the result....