MTG Salvation

Hello everyone,

I'm currently working on two decks around the same idea, one for Brawl, the other for Pioneer, to be played on Arena. Right now I'm mostly just looking for additional cards to get the combo working in Brawl. The combo is quite simple: loop a dying Cormela, Glamour Thief into a replacement, generating one mana free of restrictions to activate her mana ability with while doing so, and using her restricted mana on an instant or sorcery to kill her and get the replacement as well as get the instant/sorcery back. Rinse and repeat. And have one additional piece on the field to benefit and win the game with. The most ideal case is the three card combo with Cormela, Urabrask, and the loop piece. But just getting a three card loop going while benefiting with a fourth should be good enough.

So here is what I've found so far:

Cormela, Glamour Thief (obviously, this piece is essential and most likely doesn't have a suitable replacement, but she can be the commander in a Brawl deck, so access is guaranteed in that format)

Free mana generators:
Urabrask
Birgi, God of Storytelling
Bayo, Irritable Instructor (the Arena version of Electro, Assaulting Battery)
Storm-Kiln Artist
Runaway Steam-Kin (only works with three loop pieces so far, but that's good enough for now)
Pitiless Plunderer

Loop pieces:
Come Back Wrong (the card that sparked the idea)
Molten Duplication
Electroduplicate
Devastating Onslaught (X=1 pretty much makes this the same as Electroduplicate)
Three Steps Ahead (4 mana, but I believe, I can get enough cost reducers into the Brawl version to make it work, maybe?)
Blood for Bones (4 mana, but I believe, I can get enough cost reducers into the Brawl version to make it work, maybe?)

There are several 3-4 mana blue spells that make token copies just like Three Steps, but I have not yet found a way to repeatedly generate the second blue mana required for casting them on a loop.

So, does anybody know of more cards to fulfil the three essential roles of the combo?

I think, I found another line to pull the combo: Clones. Any Clone, that copies the name and stays legendary will result in Cormela or the Clone dying to the legend rule. There should be a window to cast either Presumed Dead or Demonic Gifts on the one I tap for mana while keeping the untapped one, thus alternating between Cormela and her Clone and accumulating mana. I could probably also include some "free" sac outlets, but Clones should provide additional utility, like copying my opponent's stuff when in a bind. The two spells are the only ones I've found that are cheap enough and return the creature untapped and right away.