Bronze Guardian is a rare Artifact Creature — Golem card from The Brothers' War Commander (BRC), collector number 70. Current market price: $0.75, TCGplayer market prices via Scryfall.
Double strike Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) Other artifacts you control have ward {2}. Bronze Guardian's power is equal to the number of artifacts you control.