Also, before I forget: I'm considering building a new Commander deck with Geist of Saint Traft or Bruna, Light of Alabaster as the star of the show. Either way, it's gonna be white/blue voltron aggro-control in general that has Spirits at the low end of the curve and Angels at the high end (yeah, I kind of just want an excuse to be able to make Brisela tbh, but also be a viable deck). I mean, I love my Sydri deck, and while complex, degenerate, durdly combos are fun, it's not my style. I much prefer faster paced, disruptive aggro-control that destroys your tempo, protects me, and throws a bunch of small fliers or swings a big flier in your face.
My question is: can I include Archangel Avacyn in the deck, even though her transformed side is red? It's not a part of her mana cost or anything. Same goes for Westvale Abbey->Ormendahl, Profane Prince (sacrificing spirit tokens into him!).