Which Mystic to R3 for Valiant

Romulix

Just finished my first clear of Necropolis and 100% Act 8.

For reference, I don't usually push into Gladiators Circuit in Battlegrounds. But I usually end in Vibranium and max out the Solo Event.

I am looking to explore Necropolis next and possibly do some other Carinas challenges.

I find that Dragon Man, Sassy, and Mangog all do about the same on Defense.

I really want to pull a Wiccan, Kushala, or Juggs. But no dice so far. So, I guess no point in waiting now. I can always get Juggs or Wiccan from Necropolis 7* Starter Pool Selector.
My only R3 so far is Bishop.

EdisonLaw

Sasquatch

Without question, but the others are cool