MAGIC: THE GATHERING
Name a nonland card. Target player reveals his or her hand and discards from it all cards with that name.
Flashback - Sacrifice a creature.
Cabal Therapy has often been called the most skill intensive card in Magic. Being able to correctly deduce what cards an opponent may be holding and what cards you can and cannot play around makes for very fun, but very difficult Magic. Try playing it with Gitaxian Probe for "easy mode".