Dark Angels and Imperial Guard
Advantage 1: Divination is really helpful for those Imperial Guard guns. Cast Prescience on a blob squad and you're golden. Most of the Divination spells are great when used on the Imperial Guard.
Advantage 2: Survivability in the form of the Deathwing. These guys can really help out the fragility of Guardsmen, whilst the Guardsmen offer the ability to cover the tabletop.
Gimmick 1: I thought it'd be awesome to take a Psyker Battle Squad and Ezekiel for Mind Worm. Unless I'm vastly mistaken, that's a 35/36 chance to remove an enemy character from play (unless they get Deny the Witch, obviously). Unfortunately, you have to take Ezekiel for this combo which will only work once in a game, really, and after that he kinda sucks with his shitty basic powers and his MC bolt pistol.
Gimmick 2 (thanks Arcane!): Azrael in a blob squad to give them all 4+ Invulnerable saves and some combat punch, as well as an extra special weapon. I believe his Chapter Banner would also work in this situation, making the Guardsmen a more fearsome prospect. Terminators won't hesitate to charge them, but doubling your Str 3 attacks can definitely deter Wyches, Orks, or other low-armour/low-toughness assault units.
Last edited by MidnightSun; 08-21-12 at 11:13 AM.