Put the rest of the cards on the bottom of your library in a random order
PSE Prismatic Secret Rare Ultimate Fusion X SPELL Quick-Play During the Main Phase: Fusion Summon 1 Fusion Monster from your Extra Deck that mentions "Blue-Eyes White Dragon" or "Blue-Eyes Ultimate Dragon" as material, by shuffling the materials mentioned on it from your hand, field, and/or GY into the Deck, then, you can destroy face-up cards your opponent controls, up to the number of "Blue-Eyes White Dragon" and "Blue-Eyes Ultimate Dragon" used from the field as material
Its not Volrath's Stronghold or Academy Ruins
So I would include 4 Uxie, and 1 each of Azelf and Mesprit in a spread damage psychic type deck
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If it's an instant or sorcery card, you may cast it without paying its mana cost