It does give you a sneaky strategy to play with, where you'll steal opponents' lore and interfere with their board state while buffing your own questing and challenging characters
Sapphire continues the trend from Rise Of The Floodborn of showing how powerful synergy between characters can be with Huey, Dewy, and Louie, particularly with Huey's ability, Three Nephews, which allows you to draw three cards if one of each of the Nephews is on the field
You don't really see overhanging arches spouting lava, rather it's just a big cave with lava pits (that you can traverse, at that)
There was more than one twist in FInal Fantasy X, and I dont want to spoil things for you
There are three drops in total: Weapons, Grimoire, and Game Over