What does "by placing the top card of this Digimon [...] as this Digimon's bottom digivolution card" in this card's inherited effect mean, exactly?
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Official Ruling
It means that you place the top card of the Digimon with this card in its digivolution cards as the bottom digivolution card. For example, if you have a level 4 Digimon with just this card in its digivolution cards, you place that level 4 Digimon card under this card. This will turn this Digimon into a level 3 Digimon with the level 4 Digimon card as a digivolution card.
