Tezzeret, Betrayer of Flesh

The static ability names the deck before the loyalty abilities ever fire: discounting the first artifact activation you use each turn is the line that separates an artifact deck from a blue deck splashing a couple of trinkets. This is the version of Tezzeret built for a board of small artifacts that want to tap for value on repeat, not a single splashy engine, and it is the constraint that pulls him toward an affinity-adjacent shell rather than a control pile. Everything he does downstream feeds that identity. The +1 is filtering dressed as looting: pitch an artifact and you net a card, miss and you break even, so your hand never actually shrinks and the ability grades up the more artifacts you run. The -2 turns any inert artifact into a 4/4 attacker (or animates a Vehicle at its own stats), which converts dead permanents into a clock without spending real cards on it. The ultimate rewards the plan it demanded all along, drawing off every artifact that becomes tapped once you have a board wide enough to feed it. The through-line is commitment: other Tezzerets ask for a pile of artifacts and pay you for it, but this one asks you to build around repeatable activations specifically, and the discount is the price of admission. He is less a payoff you jam into any blue-artifact deck than a reason to construct one that taps out for value every turn.