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I also think that the Sylvan faction is unbalanced!
Especially when it's Wing or Ossir on levels 15 and above. Here are some more reasons why I think so:
1. The faction became much stronger when alternate paths for creatures appeared (in my opinion, they are very versatile and powerful).
2. Also, casting the "Arrow" spell no longer costs initiative points for the hero.
3. Now, you don't need to select specific creature tiers to include them in spells.
4. In general, leveling up to "Caster Ability" (CA) is also a good strategy (CA is, in my opinion, one of the best, if not the best).
5. Now, you can create a decent Chaos Knight from a Sylvan Elf.
6. Sylvan Elf is a great archer.
7. As already mentioned, with Wing (and even without him), this faction has the highest initiative.
Sylvan Elf is a versatile faction.