Tribute 1 Spellcaster Pendulum Monster with 2500 original ATK; Fusion Summon 1 "Supreme King Z-ARC" from your Extra Deck by banishing Fusion Materials mentioned on it from your hand, Deck, Extra Deck, field, and/or GY, but negate its effects unless at least 1 each of your "Pendulum Dragon", "Xyz Dragon", "Synchro Dragon", and "Fusion Dragon" monsters are currently banished. You can only activate 1 "Soul of the Supreme Celestial King" per turn.
