The enter the battlefield trigger goes off
Stage 2 decks especially benefit from Alolan Ninetales-GX because it can grab those Rare Candy right when you need them, but there are countless other ways to utilize the powerful ability, like making sure your Ultra Beast deck always gets two Beast Ring on the right turn
[Main] By placing 1 [Greymon] and 1 [MetalGreymon] from your trash as 1 of your [Agumon]'s bottom digivolution cards, that Digimon may digivolve into [WarGreymon] in your hand without paying the cost, ignoring its digivolution requirements
However, while the Blue-Eyes White Dragon is an easy addition to such a list, a lot of other Dragon Deck builds may dominate matches more frequently than players think
Im including it here simply to illustrate the point where you should look towards effort over payoff when it comes to evaluating how good a build-around card is
If a permanent returned to the battlefield by Xu-Ifit's ability has an ability that triggers "when" it enters, it will lose that ability before it can trigger