A lot of the unearth cards from The Brothers' War are colorless artifacts, but I've sorted them into colors based on their Commander color identity from the unearth pips
Despite the game's serious themes and story, it still retains some of that classic Final Fantasy shine that's translated well to the Tidus' card art
It might not get to stupid amounts of mana ever nor does it get to high amounts that fast but it makes the game go on sufficiently long that it probably has access to more mana over the course of the average game than most cube decks (that don't have an infinite mana combo)
UR Ultra Rare Rescue-ACE Fire Engine X FIRE Level 7 [ MachineEffect ] ATK 2500 DEF 2500 If a "Rescue-ACE" monster(s) is Normal or Special Summoned to your field, except "Rescue-ACE Fire Engine" (except during the Damage Step): You can Special Summon this card from your hand
You can infinitely draw cards off of Archmage Emerituss magecraft ability, drawing until you get all of your combo pieces to win the game
The math changes when youre playing artifact creatures, and then youre casting Plague Wind in disguise, only paying 6 mana instead of 9