Pythium (my favorite

):
-> Comminions! Read Baalz's guide.
-> Don't waste your A. theurgs time. They should forge, cast artillery and summon....
-> Angels. All the types you get have their uses and are *awesome*. You should probably slap 4S4F on your pretender for easy access to the choir.
-> Your regular troops are great. You should choose great scales and make lot's of armies. Principes, Emerald guards are ridiculously good.
Use hydras for plan B and for stopping them tramplers.
-> Astral Fires, paralyze, soul slay, enslave, falling frost, fog warriors, thunder strike etc
-> N4 on pretender and growth scales for old mages.
-> BE troops. Later anti-magic, WotF, Master Enslave.