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This mechanic is excellent for hiding your intentions from your opponents, especially if they use hand-revealing spells

So if you have Sparkling Crystal on a Cinderace ex, and you are missing that Fighting Energy to be able to use its Garnet Volley attack, you can use Sparkling Crystal to bypass that attack

Its not an ideal or perfect creature, but itll consistently damage your opponents for free if youre playing it in a deck with a strong discard strategy

For returning a permanent, this can be used both offensively and defensively, keeping your important permanents safe or setting the opponent back on mana by making them cast it again