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Personally, we've been playing together for a while now, and in every game, everyone picks a Ballista-Monk and a Champion. When playing for survival, I'm the only one doing it. Of course, you can argue about Ballistas and Spearmen, but Champions are definitely better than Angels! In general, when I first started playing, the common strategy was to have one ranged unit and one melee unit, either a Spearman-Monk or a Ballista-Knight.