You are forced to play a memory game. You get 5 attempts to match cards. Any cards you match, you add to your deck. There will always be 1 pair of Curses, Rares, Uncommons, Commons, Colorless Uncommons, and either Bash, Zap, or Neutralize, based on which character you are.
In Ascension 15 the colorless cards are replaced with an additional pair of curses.