The Moon

The Moon enters with 3 Time counters on it.
When The Moon enters the battlefield, each opponent sacrifices 3 nonland permanents.
Then you may choose one of those permanents.
You may play it this turn without paying its mana costs. Sacrifice it at your next upkeep. If the Moon is put into the graveyard from anywhere, put it back into your library third from the top.

At the end of your Endphase remove a Time counter from the moon then if the moon has no counters on it you win the game.