DerWaffle

Big thing is tzeentch can layer on to hit debuffs like crazy, particularly daemon-side. Locus aura, plus the conflagration command trait that works vs shooting trait is one, and it's not hard to fit a good portion of army in there. Changeling can do their thing in the enemy hero phase. The you've got arcane suggestion and treason of tzeentch. Lotta ways to kneecap big units.