One of the best Tower Defense games to date- Nothing really to do with CCG but awesome.
Real time (pixel junk monsters, commet crash)
Pause at end of each wave (balloons)
Pause whenever( Crystal Defenders)
This is a pause whenever TD game, and its the best one of those in the genre. The way it plays is you get to choose 5 monsters of the ones available to you (this is your "deck" but really isn't a deck). When you kill enough a monster in the waves you can have the option of buying one to add to your collection.
This is the beauty of the game- by the end you have ~60 monsters to choose from- but only get to slot 5. So figuring out the best army for a given stage is tough.
There are 5 elements- fire, water, earth, holy, and dark
2 types of attack (magic and physical)
and ground based and flying units
So there really is a lot to the game
There are 5 maps with easy, med, hard, + time attack, + a special level where you get a crazy amount of resources to battle even crazier waves + one thing I haven't unlocked yet.
All in all its an awesome game, combines hard strategic tower defense with the oooohhhh shiney!! aspect of CCGs.