Sardian Avenger is a rare Creature — Goblin Warrior card from The Brothers' War Commander (BRC), collector number 43. Current market price: $0.86 (foil $1.66), TCGplayer market prices via Scryfall.
First strike, trample Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the number of artifacts your opponents control. Whenever an artifact an opponent controls is put into a graveyard from the battlefield, this creature deals 1 damage to that player.