If an effect digivolves onto a Tamer as if it is a Digimon, do I treat the Tamer that becomes a digivolution card as if it is a Digimon when digivolving?
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Yes, treat the Tamer as if it is a Digimon when digivolving. "When digivolving" effects and "when a Digimon digivolves" effects are triggered.Additionally, if a "Digimon can't digivolve" effect has activated, you cannot digivolve a Tamer as if it is a Digimon with this effect.
Source: BT12-015 Aldamon