pokemon dark phantasma booster box s10a Pack Made in Japan Dark Phantasma (TCG) - Bulbapedia,

Its ability to generate three mana of a single color gave players a massive advantage in MTG matches, leading to its inclusion in the Power Nine

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Each one of these creatures brings something unique to your deck, giving you access to different colors of mana or special abilities to build your deck around

Venerated Rotpriest When I first saw this card, I didnt think too much of it

However, they require multiple Energy types to use their attacks, which make them highly inconsistent when Energy generation is randomized and thus require the entire deck to revolve around them or to have some other utility that does not involve attacking, such as "Druddigon" ( Mythical Island )