Sai, Master Thopterist

The 1/4 body is the tell: this is not a beater, it's a wall built to survive while two engines run in parallel. The cast trigger fires on every artifact spell, not on artifacts entering, which means it rewards spell volume over permanence and gives you a stream of flying chump-blockers or attackers just for doing what an artifact deck does anyway. The sacrifice ability is where the design tightens: it converts those very Thopters (or any artifacts you've stockpiled) back into cards, so the token generator and the card-draw outlet feed each other. You cast artifacts to make Thopters, then eat Thopters to draw into more artifacts. The friction is the two-artifact cost on the draw, which keeps the loop from spinning for free and asks you to keep a board worth dismantling. That tension, between hoarding tokens for defense and feeding them to the maw for fuel, is the whole decision space this card hands you. It sits in a small line of blue artificers who turn the artifact subtype into a resource rather than a payoff, and among them this one is unusually self-contained: a single card that produces its own fodder, blocks while it builds, and refills the hand without leaning on outside sacrifice outlets.