Qwerty
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2 Joker
No, that's not fairer!
Why should computers play? Do you conduct all battles in this way? It should be player versus player; that would be truly fairer. You'll overwhelm any level 1 unit with upgraded fairies, as well as golems and more!
I would move these fairies to third place, after centaurs and halberdiers. And I would logically move skeletons down.