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To block the Elven Archers, you need to find a place for the Crystal of Secrecy. But there won't be one, because we're using a tactic (or better yet, Wing, who has the tactic from the start). We place the Elves in a corner, with Ancients dug in in front, and Druids on the side, who are tough guys and won't be taken down in one or two hits.
So, the Mage will take them all out at once with a Fireball, right? Yeah... what a great strategy!
Elemental Gargoyles will suppress the Unicorns' aura...
Topic about Druids: I never took the Elder ones... with their minimal magic, it's not worth taking them instead of Elves... I took them once and regretted it! Although Chaos magic against Mages... isn't great either... In general... it's a bit of a mess...