pokemon ex power keepers booster box TCG: Pack (Raichu) 2007 Pokemon EX Power Keepers

The pitch itself barely needed a pitch meeting: take the actual Duel Monsters card game, cram in over a thousand cards, and let the DSs two screens do what a real card table always wished it could, which is render your monsters in flashy 3D up top while the actual decision-making, deck construction, knowing what a Trap Card does, happens down on the touchscreen below

This issue was eventually properly rectified when later printings of Gazelle and Chimera were given archetype conditions to explicitly state that they are members of the archetype

Why is all of this happening, you might ask

Officially labeled as a Tag Team card featuring both Mew and Mewtwo, the unit was a game-breaking ally that could eliminate any threat with the moves of lost GX and EX Pokmon