Armix, Filigree Thrasher is a uncommon Legendary Artifact Creature — Golem card from The Brothers' War Commander (BRC), collector number 103. Current market price: $0.38, TCGplayer market prices via Scryfall.
Whenever Armix attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you control plus the number of artifact cards in your graveyard. Partner (You can have two commanders if both have partner.)