Tempt the Future

Fateseal 5 (Look at the top five cards of an opponent's library, then put any number of them on the bottom of that player's library and the rest on top in any order.)
Madness {1}{u} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
This spell has split second as long as it was cast from exile.