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When generating a starting save (in the map editor), the "Human Player" option is usually disabled for all heroes except the starting one... So, you can only play as an ally on random maps... At least, that's a normal rule for normal tournaments. Or does Iron know some magic trick?
I'm almost afraid to say it. On the portal, they'll immediately declare it a bug, no, better yet, a cheat. I'm a well-known cheater :)