They were Team Aqua and Magma Pokemon that were their normal type and Darkness (like Team Aqua's Kyogre being Water / Darkness)
In an artifact-heavy deck, this could mean all sorts of shenanigans on turn one, and easy casting for expensive artifacts later in the game , leading it to be perceived as one of the most powerful cards ever printed
Fallen IdealFallen Ideal: Not only is this Aura absolutely crazy with one-shot potential, it returns itself to hand if the creature dies, making it less susceptible to two-for-ones and more valuable as a grindy value piece
You cannot use a Fusion Substitute for this effect and the Fusion Monster cannot be Special Summoned after it leaves the field (because any monster from the Extra Deck must be Summoned the "proper way" [Fusion monsters are Fusion Summoned, etc.] in order to be Special Summoned from the Graveyard or if banished).
You can, however, pay additional costs, such as a kicker cost
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