Kamikaze
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Well, everyone wants an "arena." Because it would make for a very interesting tournament.
But I think 10 people is the maximum. Because if about 5 people are evenly matched, that's 5*4*2/2 = 20 battles! And if there are ten, we'll be fighting until morning :D
As for autobattles: this is a very subjective thing, because people can choose different troops depending on their magic, and the computer doesn't know how to use magic effectively.
