Thoughts:

Not a fan of syncopate.  Swap for 2 other counterspells.  1x Essence Scatter for sure, then either Negate or the 4th Dissolve.

A single Ratchet Bomb can do a lot, imo, as can a single/2x Quicken.

Is Elixir necessary maindeck when we're running 3x Elspeth?  If I were to cut 3x Elspeth to 1x + Aetherling main, then Elixir seems reasonable tho.

William Jensen's list is -3 Last Breath, -2 Elspeth, -1 Essence Scatter, -1 Jace AoT, +1 Az Charm, +1 Dissolve, +2 Quicken, +2 Divination, +1 Ratchet Bomb.

3x Elspeth seems like a lot, but it's pretty good card.  I think +2 Quicken and +2 Divination is really neat.  Otherwise more liking Lossett's list, swapping Synocpates for other counters and finding a spot for a Ratchet Bomb + possibly messing with win cons.