Aggressors with Biologis. Lots of twin linked weapons and autowounds.
10 Assault Intercessors with jump pack + Chaplain (rapid ingress so that you get safe charge next turn with all of them). Grenade Strat (3 MW on average) then charge (5,5 MW on average). Crozius ability (1MW on average). Then chaplain attacks hit on 2s and wound on 4s, Fist hit on 3s and wound on 4s, and all 36 attacks hit on 3s and wound on 5s are still a good weapon. They are even better as Black Templars or Blood Angels