For this strategy we need:
1)7 Graveyards
2)20 Necromancers
3)8 Obsidian Statues

Ok the first thing that you need to do is to build all these Graveyards.The train Necromancers and Obsidians.After you have trained Necromancers and Obsidians then:
1)Move the Necromancers to the Graveyards
2)Right-Click the Mana Regeneration ability (Obsidians)
3)Right-Click Summon Skeletons ability (Necromancers)
4)The Necromancers will begin to summon units but this spell requires mana of course.However Obsidians will regenerate their mana with their spell.

Note:Skeletons don't require food
Tip:You can upgrade the time they last at the Temple of the Damned and also the units the Necromancers summon.

Enjoy xD

Sounds dun, but how are you supposed to win a single game with that?

rofl^^ this is a funny tac nice share +rep

BuHuu....What the &$#$??
Don't you get it with these you can summon unlimited Skeletons and send them to the enemies base!!!!UNLIMITED SKELETONS!!!!!With out paying gold,lumber or food!!!!

im sure you will level up your enemy>