Multiple Assemble the Players and Disguise
Casting a disguise creature off the top of the library when you have 2 Assemble the Players in play causes you to choose which one of the Assembles to use to cast the creature, but then forces you to cast the creature face up, something that is impossible if you don't have the correct mana to cast the face up side of the creature.
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Astantia#24006
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