Alan
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If you don't upgrade them, then it's simpler and you don't even need to build them... :)
And I don't build unicorns either. As for the tank made of treants, it only works if you teleport them to the back and have them burrow in with upgraded units, otherwise, they need protection from those who rush in. And in my attack, I have fairies (attack on three targets without retaliation), dancing with death (attack on all targets), and a dragon (attack on two targets).
P.S. As for unicorns, I only use a couple in the center to protect the archers with their resistance. 8)