Halo Fountain

Alternate win conditions usually gate themselves behind a payoff so absurd it functions as a punchline, and the fifteen-untap clause reads that way on paper: assemble fifteen tapped creatures, spend five white, and end the game outright. But the engine underneath is real. All three abilities run on the same fuel: they untap creatures that are already tapped, so the deck wants bodies that spend themselves for value. Attackers, tap-to-activate abilities, convoke fodder, anything that leaves a creature exhausted and ready to be reset for a Citizen or a card. That requirement runs against the grain of how untapping normally serves a deck. Vigilance actively hurts you, because a vigilant attacker never taps and never becomes a resource the Fountain can spend; mass untap effects hurt for the same reason, since the card needs tapped creatures to pay its costs, not untapped ones. Each ability taps the Fountain itself, so it fires once per turn unless you have a way to untap the artifact. That constraint keeps the token motor honest: the deck grinds forward in single increments, converting a tapped board into Citizens or cards, then re-tapping those Citizens on later turns to feed the next activation. The win clause is the roof, not the floor. What separates this from other alternate-win artifacts is that it rewards a wide, active board rather than a specific combo piece, and fifteen is tuned high enough to resist pure token spam while staying reachable for a creature deck built to keep tapping.