The title says it all, really! Being able to submit a high level character that you think would perform well on the Caverns would be an interesting contest, plus you could potentially get some interesting ideas from it.
Probably! If it's a new CoC character and the league is made up of CoC characters, it would seem logical unless the winner is a new legendary character.
I've had that idea for a while, I even messaged Flax about it. And yeah, if anything then the contest would be as open as PvP maps one.
I'd like to submit an Ogre archer lol "Backfiring Bolt" 5 damage penetrating Range 7 Deal 3 piercing damage to yourself and all nearby characters. "Oops me sat on bow again"