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Which means you can use the effect, go through your plays and get a Rainbow Dragon or one of its variants on the field, and then during the Battle Phase you get to pick which of your Crystal monsters gets to use that effect

For example, take While using hybrid mana in this way helped solve the design issue, we discovered that this type of mana cost caused a lot of confusion

Heres how it works: If you Link summoned during your main phase, you can special summon Salamangreat Mole from your hand to a zone that a Link monster points to

ZEXAL episode 126: "Farewell for a Friend" a b c Yu-Gi-Oh

He tries to show loyalty to the society by bleaching his hair white, but nobody notices him