Its very bad if you dont have creatures, as paying 6 mana for a double Naturalize is not optimal, but on any regular board, youll either power up a strong attack, refill your hand, or both
Into the Roil is very comparable to Boomerang, it is slightly better for normal use but much less good in a heavy bounce strategy
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
One your mana was doubled there were any number of ways to start generating massive card advantage and take over the game in short order, with Wrath of God serving as the four-drop to lead into the Wake and Mirari itself, which was usually the way things ended
The main difference is that this time each deck also has a unique legendary creature you can bring over to EDH