Sanwell, Avenger Ace
The damage-prevention clause rewrites the combat math for a 3/1 that would otherwise die to a stiff breeze: keep an artifact creature swinging and Sanwell becomes untouchable, free to crew and attack without ever trading. The condition is deliberate. It only pays off when the board already looks like the deck it belongs to, and it rewards artifacts that attack rather than sit back on defense. The tap trigger is the cleverer piece. Because it fires on any tapping, not just declaring an attack, a crew cost, a tap-to-activate ability, or an opponent's Icy-style tapper all spin the wheel: exile six, cast at most one Vehicle or artifact creature, bottom the rest. That gate is what keeps the impulse-draw honest. Six cards deep with a single cast and a narrow filter means the spell base has to be dense enough to hit, so the engine only turns over when the artifact plan around it is already humming. The card is a small aggressive body dressed as a captain: it wants the archetype assembled first and hands you the payoff second. On its own it is a fragile beater; behind a wall of machines it is a self-perpetuating threat that filters toward more of the artifacts that keep it safe.
