Limit break these two for their ability to summon minions for all allies.
I have been using Frosty in wars for my 2nd blue lineup and got lucky so far. Helo is not a bad choice to limit break too since he has the ability to cleanse.
Still thinking of which heroes of the other colours to limit break- the ⭐⭐⭐ of course. My current favourite is costumed Brienne, but in this case, we have to limit break the non-costumed version first. Since most costumed heroes are so much skilled than the original, I have to be extra diligent in tourneys andd wars to obtain those aethers💪💪