Edward Nigma, The Riddler

0: You may ask any number of riddles equal to the number of players currently in the game. But all riddles must be different each time.
+1: Tell an Opponent, "Riddle me this," and ask them a riddle. If they guess incorrect, add another loyalty counter on this Planeswalker.
+1: Ask an Opponent, "Riddle me this, don't you have a Planeswalker in your hand?" If so, put another loyalty counter on this Planeswalker.