Ragost, Deft Gastronaut

The trick is that it converts your entire artifact base into ammunition and then refuses to run out of shots. Every artifact you control becomes a Food that can be cracked for three life, and that life gain is the fuel line: the second ability sacrifices a Food to burn each opponent for three, while the end-step untap fires whenever you gained life that turn. The timing gate is what shapes the deck around it. Because the damage ability carries the tap symbol, Ragost fires once per untap, and that untap does not arrive mid-turn: it waits for the end step, and only trips if you managed a lifegain trigger somewhere along the way. So a single turn buys you one shot; the engine is a between-turns loop, cycling once each round so long as you keep feeding it Foods and cracking them for life. What makes the body worth the mana is not the 2/2 but the way it retroactively rewrites the value of artifacts already in play, turning mana rocks, equipment, and idle trinkets into a life-and-fire economy the instant it resolves. It sits in a lineage of red-white artifact aristocrats that want to sacrifice their own board for reach, but most of those needed dedicated fodder; this one manufactures the fodder from whatever you were already running.