Guys, honestly, stop saying things are impossible and actually try them. If you really need help, look back. We have about 1100 pages of comments, there are plenty of tips.
LOLOLOL, you guys are funny. New game plus is an option you get after beating the game once, you get to choose a new hero to go through the game with, and he will give you different cards than the guy you first picked.
 "Dynamic Systems"){kind=icon}
 "Epic War 3"){kind=icon}
 "Spewer"){kind=icon}
 "GeoSketch"){kind=icon}
 "Endless War 3"){kind=icon}
 "RagDoll Cannon"){kind=icon}