Wow this deck looks like a lot of fun. Seems like it’ll always have something interesting happening. Tons of variety to keep your opponents guessing what will happen next.
Two cards I would definitely put in would be Starfield of Nyx, Upkeep bring an enchantment back to the battlefield from the grave and then when you have five or more enchantments all non aura enchantments are creatures with power and toughness equal to CMC. The other one is Hallowed Haunting when you cast an enchantment create a spirit cleric that’s power and toughness is equal to the amount of spirits you have and then if you have seven or more enchantments creatures you control get flying and vigilance. Tom Bombadil seems like to be more on the fun side, but slower. Narci is just brutal card draw and lifegain/life drain on a body.
I just have one question about the praetors: since their sagas don't have a mana cost; Narci won't deal any damage correct? They also don't sacrifice. Meaning I believe they're counterintuitive to the decks design. Glissa Sunslayer and some cards from Eldraine can also be worthy contenders. Firjas retribution is also surprisingly good with Sigil of the empty throne, Battle at the Helvault, and historians boon. Turns out we make a ton of angel tokens! I also think "Doom Foretold" is some secret spice for this deck too.
In general a transformed card has the mana cost of the front side of the card. They don't sacrifice so you won't draw a card, but the drain will still happen as its tied to the final chapter of the saga resolving, not the saga being sacrificed. I do like the sound of some of those cards, I didn't think of the angel synergy but that looks really cool!