You dont need to buy any units after finding sacrifice spell. I odnt reember who figured it out, so i dont take credit for myself but this is on forum somewhere :
cast sacrifice on some you your units to get other stack biger, then resurect first stack with rune mages/turn back time on them. Be carefull about your leadership , not to get to much new units in stack you want to boost. Even 1 lvl sacrifice is usefull, but you must know you need enough dmg to get at elast 1 whole unit (870 hp for EGD). Having high astral resisstance will help resurecting, in way that you make lowered dmg you your units with sacrifice (astral type dmg), but still full resurecting count as you did 100% dmg with spell. I hope you get what i`m saying. Try it out in game you`ll figrue out how it works. So drop those paladins and go dragon army
