Strict Fusion Summon

A Strict fusion summon is a Fusion Summon that can only be conducted with the Fusion Material Monsters listed upon the card. As Such, Fusion-Substitute Monsters such as King of the Swamp cannot be used as fusion material monsters. However, with the release of Elemental Hero Prisma, and under certain conditions Phantom of Chaos, there has been created a loophole to this rule. Both of the above cards' effects change the name of the monster, bypassing the limitation as they are now considered the monsters eligible for the fusion summon.