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This sets up a "Kaiju" on the player's field, allowing a "Kaiju"-focused deck to utilize their actual monster effects and attack with them

R Rare Battle Royal Mode - Joining X SPELL Continuous Activate this card by targeting 1 Effect Monster on the field

Because, if you were to run 3 copies of it in your deck, it'd be functionally the same as having a 37 card deck, all because of the lack of a cost

Some lists opt for the classic Polymerization, pairing the spell with fusion substitutes like King of the Swamp, and sometimes Fusion Sage

However, there is one card that is specific to most FTKs that has somehow never seen any time on the forbidden and limited list