In Lorcana, you'll see various aspects of these films represented as four different types of cards: characters, items, actions, and locations
The ability to completely shut down the legend rule is extremely rare and has only appeared on a handful of cards
In Urzas Destiny (1999), they attempted to fix Card not found
Roadside Reliquary is two cards for three total mana, on a land, which is very easy to slot into a deck
Yes, experience counters can be very good, namely because so few things interact with them
Approaching each deck as a single game also provided the opportunity to dive deep into the lore of each, capturing even more beloved moments from across the games storyline that we may not have been able to achieve otherwise. The team decided on these four Final Fantasy games based on a balance of what they wanted for the gameplay of each deck and how well known each story was overall