BA Archangels Intervention Force, 3-5 Terminator squads in any combination. Shooty squads get to shoot twice when they arrive from DS, punchy squads get to do the whole disorderly charge game. This could be 15 TH/SS Terminators charging when they show up assisted by locator beacons from Drop Pods. They don't get any Reserve manipulation, but that many hammer blows will wreck just about anything.
However, as a SM player not a BA player, why aren't you using a Skyhammer Formation of grav Devs and fist/eviscerator equipped Assault marines to ruin his day?
Was also building for that option, but heard that BA had this kind of formation that was more effective. (Got the grav devs, just missing the assault marines)