Yuna is great in the 99, thats for sure but Tidus is the better Commander
Then you just cant interact. Miller joined the project about six months in, and says it took about another six months to reach a gameplay loop that the team felt comfortable with
The Sapphire/Steel deck accelerates resources to cheat out big characters early, the Emerald/Ruby deck had lots of character removal and ways to steal Lore from the opponent, and the Amber/Amethyst deck had lots of card draw and could pull off many tricks and combos
Skull Rock is the ideal Location for your Pirate characters because it allows them to trade up into stronger characters while generating extra lore at the start of your turn, while Hundred Acre Island is a great place to move characters you expect to get banished on the following turn
It may not be a simple case of summon and challenge, but rather collect, summon, buff, challenge, and recover