If anyone has Warlock but is no longer challenged by the game try the Armageddon DLC. The new game mode will force you to react to events. You just can't brute force your way through with only 4 tricked out units. You have to defend your cities and help the AI deal with the new invaders unless you want to be swampped by waves of units each more powerfull then your greatest hero.
A few hints on the new game mode.
1) Help the AI with Gates that appear in thier areas.
2) Terraforming spells are your friend.
3) You can't ignore the pocket planes, they may have "Anchors" in them.