Assemble the Legion

Nothing happens the turn it resolves: it enters with zero muster counters, and the engine only spins up on your next upkeep, when the first counter goes on and a lone soldier arrives. The math is what makes it terrifying. The following upkeep yields two tokens, then three, then four, the counter incrementing every turn and the board widening by a larger increment each time. The clock is quadratic, not linear, which is why the card reads as harmless and plays as a wincon: every turn the controller fails to find an answer or close the game, the gap grows wider than it was the turn before. The tokens arrive with haste, so there is no summoning-sickness tax on the engine's output; the soldiers it makes can attack the turn they appear. That single word converts a slow value enchantment into a genuine clock that punishes any deck short on enchantment removal or sweepers, because once the counter stack is tall enough a single wrath only buys one turn before the next, larger wave lands. The whole design lives in the upkeep trigger and the cumulative counter: a token engine whose lethality is a function of time on the battlefield rather than mana invested. Five mana buys nothing on the turn you spend it; what you are paying for is every upkeep that follows, and the asymmetry between sitting back and acting against it widens with each turn the enchantment survives.