Atomic Microsizer is a uncommon Artifact — Equipment card from Edge of Eternities (EOE), collector number 47. Current market price: $0.20 (foil $0.24), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+0. Whenever equipped creature attacks, choose up to one target creature. That creature can't be blocked this turn and has base power and toughness 1/1 until end of turn. Equip {2}