Distant Counter: B! Ephraim v Myrrh?

Both are excellent, but here are two points to consider:
* Myrrh is more unique than LEphraim for an emblem team. Myrrh has a unique stat spread and special weapon that allows her to excel as an enemy phase ranged/bow check for flier teams. With DC, Ephraim isn't all that different from other slow axe armors (e.g Hector).
* Great Flame/DC is the best option for Myrrh, but if you have 20k feathers and a spare Nowi/Tiki, Lightning Breath/Fury Myrrh is very serviceable.

Like the other guy said, out of the two Myrrh has the clear advantage. A DC Myrrh is also very flexible if you need a green slot filled.
Give her Fili shield in the seal and either QR or Vantage as B.

Personally I like Ephraim as a anti-melee wall with dual close defence (gotta use that shield). Since he can't DC that much better than any Hector, giving him DC form a Hector seems pointless.

I haven't given DC to my B!Ephraim, so can't vouch for how he does, but my DC + QR Myrrh is my go to unit for difficult maps, with some blue support she is an absolute beast