What does "if a card with [Leopardmon] or [X Antibody] is in this Digimon's digivolution cards, further reduce it by 3" in this card's [When Digivolving][Main] effect mean?
It means that the effect's play cost reduction of 4 can be further reduced by 3 if the conditions are met, so you can play 1 green Digimon card from your hand with the play cost reduced by 7.
Mar. 28, 2024
If a total of 2 or more cards with [Leopardmon] and/or [X Antibody] are in this Digimon's digivolution cards, can this card's effect further reduce the cost by 3 for each of those cards?
No, it can't. Even if there are multiple digivolution cards that meet the conditions, this effect can only further reduce the cost by a maximum of 3.
Mar. 28, 2024