Metalcraft

Cards printed with metalcraft, which switches on a stronger effect as long as you control three or more artifacts. Galvanic Blast deals 4 damage instead of 2, Etched Champion gains protection from all colors, Dispatch exiles instead of just tapping, and Puresteel Paladin drops equip costs to zero once the threshold is met. These reward flooding the board with cheap artifacts and Mox-style rocks. Distinct from Artifact Payoff, whose abilities scale continuously with each artifact you control or cast; metalcraft is a binary on/off switch keyed to the printed three-artifact count, not a per-artifact scaling reward.