A Digimon with level 3, level 4, and level 5 Digimon cards with [Aqua] or [Sea Animal] in any of their traits in its digivolution cards digivolved into this card. If this card's [When Digivolving] effect activates at such times, can I play just one or some of level 3, level 4, and level 5 Digimon cards with [Aqua] or [Sea Animal] in any of their traits from digivolution cards?
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Official Ruling
No, you can't. You must play 1 each of level 3, level 4, and level 5 Digimon cards with [Aqua] or [Sea Animal] in any of their traits from digivolution cards whenever possible.
Source: BT22-028 Ariemon