The very best combo in the game. I couple those 2 w/ the Allied General for more damage. It is about as dominate as you can get. I've got a 5* troll, but the A. General is such a tank man, especially because of his passive.
Hit first with the CR area of effect. This will weaken enemy defenses (air ride before infantry

. Hit next with your A. General (or any other toon), then mop up w/ the AoF special. The death of the enemy will grant your whole party (that has free or extra buffs from the AG) an extra turn. Hard to beat.