The Cernagon

{t} Exile the top card of your library and place a time counter on it, then exile your graveyard, library and The Cernagon. Remove a time counter to place all cards that were exiled with time counters in play as your library, then take another turn after this one.
Some say it's the physical form of time, some say it's the source of all Mana. All I know is those who have tried to use it's power were driven mad. ~Kygael Ses'quin Ulthwen exile