Bronze Guardian

Two roles that artifact strategies usually keep in separate slots collapse into one body here: the payoff that grows off your board, and the protection package that keeps the board intact. A creature whose power scales with your artifact count is old news; grafting double strike onto that scaling turns each artifact you deploy into two points of combat damage, so the body hits for far more than a plain "counts your permanents" beater that only ever swings for its own number. The more interesting half is the shield it hands out. Ward on itself is routine self-preservation, but extending Ward to every other artifact you control changes the texture of an entire deck: any single-target removal, the tuck-and-bounce answers artifact decks fear most, and every targeted disruption aimed at a specific rock or engine piece now costs the opponent an extra two mana each, applied board-wide from one source. The tax does not stop removal, and it does nothing against effects that never target the artifact itself, so an opponent's edict or board wipe sails through untouched. What it reprices is the precise, surgical answer: the exchange where they spend a spell to pick off your best piece. In a deck built on fragile mana rocks and interlocking engine parts, repricing every one of those exchanges is close to stopping them, and it lands in the color that has always been the natural home for defending a wide, valuable board.