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Worldgorger Dragon is another which has had some mild uses as part of combos

Likewise, Meowth seems like a card purely made for collection purposes, although that could change if a strong Persian card is released in the future

The Final Fantasy Universes Beyond set chose to represent crystals as a new artifact cycle, which combine useful cost reduction with powerful passive and activated abilities

Great Fire Special Energy Cards To Use Heat [Fire] Energy cards are special energies introduced in the Darkness Ablaze expansion that came out during the summer of 2020

Uncounterable is a nice perk although not that frequently relevant