Inferno tactics.

I like playing with weak castles, and I often win. With Inferno, this is the tactic, but if the game is long and on XL+U
Hero Zidar (Magic)
Efreet, Devil, Cerberus from Inferno
From griffin towers and various hives, Angels, Wyverns

Try to find another castle within two weeks, build archers there, and 6-7 level units, and strong damage dealers, even 4-5 level
Even the spell of prohibition won't help here, and magic to gather normal units and fight them... I often do this.