[Micah]

Killing the leader via remote spell, then just drop a call of the winds or similar on the dragons and they'll 'splode with no magical leadership on the field. Or if you can pop the leader in combat that works too.

And Jedi's right, their MR is kind of janky, so opposition or the like should make them cry.

SCs should also be able to take down a bunch of them pretty easily. Anything size 5-6 should be safe enough from the trampling and if you add on eth/luck and regen they won't be able to do lasting damage with their normal attack. Then it's just a matter of how many of them you can hack through before you rout on turn 50 (or if you're defending they'll again dissolve when the leader routs, so you don't even need to kill them off)

They're really much less nasty than, say, 5 aboms =)