To Girlboy5 and anyone with the same question: Play as Viegraff the Red. He gets the succubus and the rider. He also gets an awesome spell called Phoenix Strike.
Earthfire, I thank you for the advice and mean no disrespect, but that really doesn't tell me how to get EVERY card on one character. This just tells me how to beat the caves. I need all the non-ultimate cards for grullborg.
 "Another Cave Runner"){kind=icon}
 "Gravity Guy"){kind=icon}
 "Dream World"){kind=icon}
 "Ninja Hamsters vs Robots"){kind=icon}
 "Ge.ne.sis"){kind=icon}
 "Little Wheel"){kind=icon}
 "Alice is Dead - Ep 2"){kind=icon}
 "You Won Life"){kind=icon}
 "Newgrounds Rumble"){kind=icon}
 "FeedYourBot"){kind=icon}
 "Doodle God"){kind=icon}
 "Epic War 3"){kind=icon}