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At the beginning of your upkeep, put a muster counter on Assemble the Legion. Then create a 1/1 red and white Soldier creature token with haste for each muster counter on Assemble the Legion.
If Assemble the Legion isn't on the battlefield when its ability resolves, use the number of muster counters it had when it was last on the battlefield to determine how many Soldier tokens to put onto the battlefield.
