There are so many different Final Fantasy games from across four decades that are important to a wide swath of people for different reasons that the designers at Wizards had to have been absolutely swamped with possibilities
Use this turtles trigger with cards like Loot, Exuberant Explorer or basic land fetch cards like Cultivate
Beyond that is typical storm stuff: Ritual Spells like Dark Ritual, Rite of Flame, and Seething Song are good for generating bursts of mana, especially since Kess can cast them again from the graveyard
Traditional foil borderless mythic rare Planeswalker cards are found in fewer than 1% of these boosters, and a foil-stamped Signature Art Card replaces the Art Card in 10% of boosters
Load up on cards like Dreamtail Heron, Migratory Greathorn, Archipelagore, Gemrazer and Auspicious Starrix and things will get ridiculous