Visions of Oblivion

As an additional cost to cast to cast Visions of Oblivion, exile X cards from your graveyard and top of library.
Each player reveals their hand and library, puts all non-land cards with converted mana cost X into their graveyard, then shuffles their library.
"Each time the dream takes me through a new future, and each time to ever more gruesome ends."
- Sillex, the Hollow Dreamer