Here's the Saga refresher: Sagas are enchantments that enter the battlefield with a lore counter on them, causing the chapter one ability to trigger
Reanimating any nonland whenever you cast an artifact or legend, for free, is VERY abusable and powerful, even for just a turn
Changelings like those created by the included Black Market Connections can help fill out the party, but the fragile nature of trying to keep so many combo pieces on the field at the same time and protect them means that the deck should place a premium on cards like Giver of Runes that both fill a role in the party AND protect other party members
It just taps for mana now, like most land will
The deck scales smoothly at every investment level
Every game I played with this deck, it actually got close to winning, but never made it