If this Digimon has 3 or more digivolution cards and I have a Digimon with the [Light Fang], [Night Claw] or [Galaxy] trait, is the digivolution cost still reduced by 2 when digivolving this Digimon into a Digimon card in my hand?
No, it isn't. This card's effect reads "when this card would be [...] digivolved into," therefore the effect doesn't activate for digivolutions from this card.
Mar. 28, 2024