Oelm
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The main criterion is that archers should be able to eliminate the stack in two hits. That is, around 20 griffin riders + experience/advanced ranged attack can do it. Goblins are the main attacking stack. The goal is to manage to block the right and middle medusas with the left army. In the first turn, we don't attack with the vivas, but only cover them (and maybe also with basilisks). And we eliminate everyone with goblins + the left flank. We attack the left medusas with archers. I don't remember the exact details right now, I might write them down later. Experience armor is needed. The losses are approximately: the left flank, a couple of basilisks, and part of the goblins. This depends on how often petrification occurs.