Kavaron Harrier is a uncommon Artifact Creature — Robot Soldier card from Edge of Eternities (EOE), collector number 139. Current market price: $0.19 (foil $0.27), TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may pay {2}. If you do, create a 2/2 colorless Robot artifact creature token that's tapped and attacking. Sacrifice that token at end of combat.