Tezzeret, Cruel Captain

Most planeswalkers with triggered loyalty engines ask you to build toward the ultimate; this Tezzeret asks you to keep the artifacts flowing and lets the loyalty pile up as a byproduct. The passive that ticks a counter every time an artifact enters is the whole self-reinforcing loop: in a deck spitting out Treasure, Clues, or cheap artifacts, it armors itself up toward the emblem faster than any conventional plus ability could. That inversion changes how you protect it. A traditional walker climbs by choosing loyalty over impact each turn; here the climb is free, so the 0-cost untap (which also grows an artifact creature) can be spent on tempo instead of survival. It does quiet pseudo-vigilance work, letting an artifact creature swing and then untap to block, or freeing a tapped mana rock mid-turn. The −3 points squarely at the cheapest slice of the artifact pool, so the engine can fetch its own fuel: another one-drop to feed the passive, another loop to close. The emblem does not win on its own; it is a repeatable anvil that also animates noncreature artifacts into attackers, meaning the payoff stays contingent on the artifact density you were already rewarded for building. The design is coherent all the way down: every ability points back at the same axis, and the loyalty math only works if you are already doing the thing the card wants.