So, my favorite hero at the moment is Ilfina (veteran difficulty).
1.
If you manage a single unicorn correctly, you can avoid even losing units at the start (against melee units). If archers of any race are present, it's a different story, and losses are likely.
2.
The tent simply saves our unicorn from death if you accidentally expose it to heavy neutral attacks.
3.
When the town reaches level 9, instead of 4 druids, you can build unicorns. I agree that there are few of them, and they don't provide much benefit yet, but if we chose druids, we should also build ponies that week (if we didn't build druids in the first week).
4.
The hero has light, which is great, especially in the mid-game when we have around 18-25 light unicorns (or more) in our army.
