Glint Hawk Idol

An artifact that pays no upkeep tax to exist as a noncreature permanent until you need it to swing or block. The two-mana artifact body is the whole trick: it sits on the battlefield outside the reach of sorcery-speed creature removal, ignores sweepers that only hit creatures, and counts toward artifact-count thresholds the rest of the turn, then flips into a 2/2 flier the moment another artifact enters or you spend a white mana. The animation is conditional in two directions, and that doubling is the design's real intelligence. The triggered half rewards a board built to flood the table with artifacts, and because it keys off another artifact entering rather than being cast, artifact lands and tokens wake it up just as readily as a hardcast permanent, turning the Idol into a recurring evasive attacker that costs nothing extra. The activated half is the insurance policy: even in a hand starved of other artifacts, one white mana buys a flying blocker at instant speed, so the card is never a dead permanent waiting on its enablers. Both modes leave the body a creature only until end of turn, which is the friction that pays for the evasion: it cannot block on a turn you have no mana or trigger to rouse it. The immunity it does buy is partial. Asleep, it remains an artifact, so it still answers to Shatter and to effects that tap artifacts. What it dodges is the half of the metagame aimed only at creatures.