Virtually zero cost, anyone can max 30 1*s over a weekend with a pile of swords and a little ham.
Great tile play is rewarded (troops will play a part, but at the scale of 1*stats, it’s not nearly as significant)
This would include double the participants at 60
The one difficulty will be match making to ensure the 2 alliances meet. But it’s been done before and, to be quite honest, we’d be pulling help in coordinating it from some of the best at gaming the system. No guarantee, but the risk vrs the reward of an epic war is worth it, in my opinion.
I think its easier for everyone to have CHAOS line up:
C: Costumed + all heroes you name it
H: Hero of the month
A: Atlantis heroes
O: Other heroes (non Costumed, non HOTM, non Atlantis, non Seasonal)
S: Seasonal event Heroes