Arbalest Engineers is a uncommon Creature — Human Artificer card from The Brothers' War (BRO), collector number 206. Current market price: $0.21 (foil $0.25), TCGplayer market prices via Scryfall.
When this creature enters, choose one — • This creature deals 1 damage to any target. • Put a +1/+1 counter on target creature. It gains trample and haste until end of turn. • Create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")