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[1] Activate 1 of the following effects, also you cannot Special Summon monsters from the Extra Deck for the rest of the turn, except Synchro monsters

Gameplay rule for FUSION MONSTER CARDS During your turn, if you have the Magic card "Polymerization" and the Fusion-Material Monsters required to form a Fusion Monster, either on the field or in your hand, you can perform a Fusion as a Special Summon by activating "Polymerization"

Item ID: 763433263

You can only Special Summon "Rokket Caliber" once per turn this way

Despite this, Marik weakened Ra to be useless

Special Summon 1 "Elemental HERO" Fusion Monster from your Extra Deck, ignoring its Summoning conditions