Battle against Karador on impossible

[Metathron]

Next, I tried with a completely different, expendable army:

Ancient bears
Unicorns
Black Unicorns
Priests
Griffins

Halfway through I thought this would work, when the computer started pulling stunts such as raising 71 necromancers, his 1000 skeleton warrior stack killing my (remaining) 80 ancient bears in one hit, etc.

This is just so much fun.

Edit: Oh yes, I had the druid's staff that increases animals' attack by 50%. A lot of good that did.