digimon online card game Trading Battle of Omni Single Card Promo Knightmon BT5-042 2021 Championship Regional Online Participant 12 cards per pack. Digimon Card Game: Official Online

If starting with A3-066: Not ideal since you're not generating Energy unlike A3a-021, unless you can transfer the Energy from A3a-021 with A4-151

However, in decks that can really take advantage of eternalize then it gets much better: Self-Mill decks like Sidisi, Brood Tyrant should consider this, but best of all Populate decks like Ghired, Conclave Exile are going to love it, as it's one of the best populate targets

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The turn this card is ritual summoned, it cannot declare an attack

World Championship 2015, United Gosus 3rd, Hasegawa Akira (Japan) [Nekroz] Source: Yu-Gi-Oh