what to use against Wingael?

The magic of light and the storm wind will help you – 20% initiative reduction and -2 to the speed of flying creatures.

-10% initiative and -1 to speed, as far as I know.

Invisibility doesn't help as much against players as it does against units. If they have a Crystal of Secrecy or a Wall of Swords, this problem is quickly solved, and there are enough ways to counter it anyway, especially for such a high-initiative race.
In general, it's good if you have Darkness with mass Dispel, Keen Mind, and the Staff of Sar-Iss, then you can quickly eliminate the archers, otherwise, there's a good chance that unicorns with additional magic resistance will save them.
Another option would be a dwarven set – instant mass Stone Skin and mass Dodge.