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I agree with Dirty. For example, you build a chain where the plan is to have a hero from the Dungeon faction attack your main hero while he's leveling up. Then the question arises: you've sacrificed all your other heroes, leaving only one hero who frees the Dungeon, but there's an Israelite hero there who can't attack! And what do you do with the army? Leave it so the opponent can take their army and punish you?!