The four discs of goodness consumed hundreds of hours of my time before I went back and played 7, followed by playing every game since
to draw cards or start questing
Some cards you might want to splash are Sephiroth's Intervention, Kefka, Court Mage, Machinist's Arsenal, and Seifer Almasy

Ifrit Suplex Thunder Magic Triple Triad Unexpected Request Vaan, Street Thief Warrior's Sword Zell Dincht Airship Crash Ancient Adamantoise Balamb T-Rexaur Bard's Bow Bartz and Boko Blitzball Shot Cactuar Chocobo Kick Chocobo Racetrack Clash of the Eikons Coliseum Behemoth Commune with Beavers Diamond Weapon The Earth Crystal Summon: Esper Maduin (Esper Origins // Summon: Esper Maduin) Esper Origins (Esper Origins // Summon: Esper Maduin) Galuf's Final Act Gigantoad Goobbue Gardener Gran Pulse Ochu Gysahl Greens Jumbo Cactuar Loporrit Scout Prishe's Wanderings Quina, Qu Gourmet Reach the Horizon A Realm Reborn Ride the Shoopuf Rydia's Return Sazh Katzroy Sazh's Chocobo Black Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Sidequest: Raise a Chocobo (Sidequest: Raise a Chocobo // Black Chocobo) Summon: Fat Chocobo Summon: Fenrir Summon: Titan Summoner's Grimoire Tifa Lockhart Tifa's Limit Break Torgal, A Fine Hound Town Greeter Traveling Chocobo Vanille, Cheerful l'Cie Absolute Virtue Balthier and Fran Black Waltz No

While Scions & Spellcraft is my favorite type of deck, this MTG Final Fantasy Commander precon may have my favorite cards in it