The controller of the Equipment can pay the equip cost to attach the Equipment to a creature they control (but only any time that player could cast a sorcery).
There are no hard and fast rules about what a mana base should look like
Urza's Incubator - Cost reducer stacks with Eminence
Grave Sifter Grave Sifter offers a symmetric typal effect, and if youre the only one playing typal shenanigans, this green creatures even better
Although library exhaustion makes for a less refined set of counting than direct damage, the same principles of translating some number of cards to killing the opponent applies
And while Commander precons are always themed around certain characters, colors, or strategies, the twist with these is that each one is built around a single Final Fantasy game specifically 6, 7, 10, and 14