Vault of Eternity

{x}{t} Look at the top X cards of your library. You may reveal one of them with converted mana cost X or less. If you do, exile it. For as long as it remain exiled, you may play it. Put the rest of them on the bottom of your library in a random order.
As long as six or more cards are exiled with Vault of Eternity, you may scry 1 at the beginning of your upkeep. If you do, you may exile the top card of your library. For as long as that card remains exiled, you may play it.