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Fiendsmith's Agnumday X LIGHT Link 3 [ FiendLinkEffect ] ATK 1800 DEF - 2+ monsters, including a LIGHT Fiend monster Once per turn (Quick Effect): You can target 1 LIGHT non-Link Fiend monster in your GY

Even if you avoid that, one issue is Mimikyu, which you cant deal with except with Octillery

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

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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