Wicc
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Tested in the test environment.
15 Air Elementals + 12 Water Elementals + 78 Pixies, Tunar 5-1-2-1 with advanced tactics and blessing.
Losses: 60 Pixies and 4 Water Elementals. Not very effective.
In Shades of Darkness, there are fewer starting troops, so it won't be as impressive. But in real games, the hero's stats are higher, and you can add more fire/earth units, and there might be some hiding spots. In my opinion, it should be viable with proper development.