Muck Drubb [Planar Chaos]

Flash (You may cast this spell any time you could cast an instant.) When Muck Drubb enters the battlefield, change the target of target spell that targets only a single creature to Muck Drubb. Madness {2}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)