It triggers at the timing when this card is in the trash and your [DoruGreymon] would be deleted
Yes, if youre playing tribal against a nonblack deck, this is what we call totally broken
The cards were initially released to promote the Pokmon anime series, but the game quickly took on a life of its own
Then, when an opponents monster declares an attack the player can send a Marincess monster from their hand to the graveyard, and for that battle, no monsters can be destroyed by battle, and the player doesnt even take battle damage
That puts this into a very different place, although you can still run it like a normal Fog by chump blocking and then keeping your chumpers alive
This is a sign of poor deck-building in my opinion since rather than solving the issue of bricked PK hands we are running a card as if that card is supposed to "fix" it, when in reality Allure is a strictly worse card to open in literally every other situation, causing more problems than it solves