Which Valhalla (season 3) heroes seem most promising to you?
From what I see now:
Rare - all (or almost all) seems good, but Nordi seems like the most important (ice elemental defense down).
Epic - Almur seem the most viable (nature elemental defense down plus can get plenty of sorcerer emblems), but also Mist and Gullinbursti seem very viable, mostly as there are not so many good holy 4*.
Legendary - it is really hard for me to tell. Tyr is the only one I really wish for.