5 official rulings from Bandai, last ruled Jun 28, 2024. Straight answers to how this card actually resolves.

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 Jun 28, 2024
Does "if 4 or more were placed" in this card's <When Digivolving> <When Attacking> effect mean that the effect activates if I first place 4 or more cards for the <When Digivolving> <When Attacking> effect? Or does it activate if 4 or more [Seven Great Demon Lords] cards with different names are in digivolution cards?
It activates if 4 or more cards are first placed for the <When Digivolving> <When Attacking> effect. Even if you have 4 or more [Seven Great Demon Lords] cards with different names in digivolution cards, the effect won't activate unless you first place 4 or more cards for the <When Digivolving> <When Attacking> effect.
Ruled Jun 28, 2024
If I return 1 to 7 [Seven Great Demon Lords] cards with different names from this Digimon's digivolution cards to the bottom of the deck, can I use this card's 2nd <When Attacking> effect to delete the same number of my opponent's Digimon or Tamers?
No, you can't. If you activate this effect, you must return 7 [Seven Great Demon Lords] cards with different names from this Digimon's digivolution cards to the bottom of the deck in order to delete 7 of your opponent's Digimon or Tamers.
Ruled Jun 28, 2024
Can I use this card's 2nd <When Attacking> effect to trash 7 cards from my opponent's security stack without deleting their Digimon or Tamers?
No, you can't. Deleting 7 of your opponent's Digimon or Tamers is mandatory for this effect.
Ruled Jun 28, 2024
When I would use this card's 2nd <When Attacking> effect to delete 7 of my opponent's Digimon or Tamers, if an opponent's Digimon isn't deleted due to an "isn't affected by your opponent’s effects" effect or other reason, does that mean that the number of security cards trashed isn't reduced by 1 for that Digimon?
Yes. If it isn't deleted, then the number of security cards trashed isn't reduced by 1.
Ruled Jun 28, 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.