Clock of the Thousand Spheres

{t}: Add {p/w} to you mana pool.
2{p/w}: Put an hour counter on Clock of the
Thousand Spheres.
At the beginning of each upkeep, put an
hour counter on Clock of the Thousand Spheres.
When the twelfth hour counter is put on Clock
of the Thousand Spheres, shuffle your hand and graveyard into your library, then draw seven
cards. Exile Clock of the Thousand Spheres.