If I don't have any Digimon with [Seadramon] in its name, and use this card's effect to play a Digimon card Seadramon] in its name from the digivolution cards of one of my blue Digimon, does the effect to "return 1 of your opponent's level 4 or lower Digimon to the bottom of its owner's deck" activate?
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Official Ruling
Yes, the effect will activate since a Digimon with [Seadramon] in its name was played earlier.