I have three little ones.
1: Javelineers rule.
2: Against most standard commanders, a Succubus with enough Blood magic to cast Hellbind Heart really comes in handy if you try an assassination in mid-attack. I usually try the spell twice, then just use an enchanted weapon. (Usually Heartfinder Sword. Who am I kidding, always heartfinder sword.) Charm would also be a good one for any assassin, theoretically.
3: Tying in with the last one, be sure to bring a decent supply of commanders along when attacking. Especially if your foe has attack spells he doesn't need to aim. (Or the aforementioned mind-control magic)
And I'm definitely going to remember the Tornado Charm. Thanks much!