7 official rulings from Bandai, last ruled Sep 6, 2024. Straight answers to how this card actually resolves.

Do I have to delete all of my Digimon for this card's <Start Your Main> effect even when I have 0 cards in my Digi-Egg deck and can't place a card in digivolution cards?
Yes, you must delete them.
Ruled Sep 6, 2024
If [Leviamon] and [Leviamon (X Antibody)] are in this card's digivolution cards, are they considered "cards with different names"?
Yes, they are. When cards such as [Leviamon] and [Leviamon (X Antibody)] differ in that one has [X Antibody] and the other doesn't, you can reference the cards as if they have different names.
Ruled Sep 6, 2024
Does [Gate of Deadly Sins] itself in digivolution cards also count for this card's "if this Digimon has 5 or more digivolution cards with different names"?
Yes, it does.
Ruled Sep 6, 2024
If multiple copies of this card are in digivolution cards, does its inherited effect overlap?
Yes, that's correct.
Ruled Sep 6, 2024
Do I have to activate this card's inherited effect when a Digimon card would be played?
No, you can choose not to.
Ruled Sep 6, 2024
Can I also activate this card's inherited effect when a Digimon would be played by an effect?
Yes, that's correct.
Ruled Sep 6, 2024
Can I use this card's inherited effect to reduce the digivolution cost by 3 even if this card has 5 or more digivolution cards with different names?
Yes, you can.
Ruled Sep 6, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.