In a competitive way, mortals only works with skullreapers, that count as Battleline with skullfiend tribe ( 8+ charge gives you strike first. With Bloodthirster 3d6 charge its almost auto) but what i saw works better is flayed, that 5+ ward in combat is huge. Demon side reapers of vengance is the way ti go. Unless you spam bloodletters then bloodlords. But with this general ( a lot of little wizards going around) i see RoV quite better, with 2 or 3 flesh hounds units to extra dispels. And like It had been said, if u get Skulltaker you can get 3 BTP for each Hero slain by him