My top ten are as follows:
(I do not own Cease and Desist as of yet)
1.Mythic Horses Robots
4.Aliens Time Travelers.
8.Mythic Greeks Wizards.
9.Ghosts Wizards(I find them more versatile then Ghosts Zombies)
10. Robots Halflings
As for my favorite combos, I would only pick for games I have won and I have not yet won 10 games yet.