Strength-Testing Hammer (Galaxy Foil) [Unfinity] San Diego Comic-Con 2017 choose target artifact or creature

choose target artifact or creature card in an opponent's graveyard that was put there from their library this turn

Each word rattles your mind

Set: Mirrodin Type: Artifact Rarity: Rare Cost: {2} Whenever a permanent becomes untapped

Set: Coldsnap Promos Type: Token Legendary Creature — Avatar Rarity: Rare Flying

Whenever you reveal a nonland card this way

Strength-Testing Hammer (Galaxy Foil) [Unfinity] San Diego Comic-Con 2017 choose target artifact or creatureSet: Unfinity Type: Artifact Equipment Rarity: Uncommon Cost: {1} Whenever equipped creature attacks, roll a six sided die. That creature gets +X +0 until end of turn, where X is the result. Then if it has the greatest power among creatures on the battlefield, draw a card. Equip {3} I don't know you, but that hammer rings a bell.