how to do mass resurrection - steps

[kcwong]

Originally Posted by Esteral

Tip: How to increase your stacks without paying for them.

Use Trolls in caves and at night. They heal themselfs.

Use lvl 1 sacrife on Troll.

Any criteria for the spell sacrifice? I have level 1 sacrifice, which does 680 damage. When I try to cast the game said there's no target I can cast it on.

My army is:
2/2 Black dragons
2/3 Red dragons
1/3 EGD
4/4 Cyclops
5/5 Trolls

The dragons are slightly damaged when I try to cast.

Is that because 680 damage does not translate to enough restored HP for a new unit of any kind? So if I swap out one of the stacks for a stack of inquisitors (much lower max HP) I will be able to grow it?