Riddler

+3: Destroy target permanent, that permanent's controller gets a clue token.
-x: Search your library for an instant or sorcery with converted mana cost X or less and cast it without paying it's mana cost. Shuffle your library.
-9: Search your library for X cards where X is equal to target permanent's converted mana cost. You may cast them for 0 mana. Shuffle your library.