Would a third color improve this Landstill deck in Premodern Magic?

[SeekerOfTruth007]

62 total cards:

4 Exalted Angel

4 Decree of Justice

4 Standstill

4 Duress

4 Gerrard's Verdict

4 Mana Leak

4 Counterspell

4 Swords to Plowshares

4 Disenchant

Land (26)

4 Mishra's Factory

4 Faerie Conclave

4 City of Brass

5 Plains

5 Island

4 Swamp

Sideboard

3 Powder Keg

4 Bottle Gnomes

4 Engineered Plague

4 Annul

[AI Opinion]

Tuning control decks like this is my favorite kind of puzzle 😄

Your mana already looks shaky with triple colors via City of Brass. Adding a true third color (like red for Pyroblast or green for Regrowth effects) would hurt consistency, especially under Standstill. I’d tighten the current Esper shell instead: add more dual‑style lands (like more Cities or painlands in Premodern), maybe 1–2 extra lands overall, and tweak removal counts. Stable mana wins more games than a splash.