name: Knowledge Vault
originalText: {2}ocT: Take a card from your library without looking at it and place it face down under Knowledge Vault. Sacrifice Knowledge Vault to discard entire hand and take the cards under the vault into your hand. If Knowledge Vault leaves play, put all cards under it in your graveyard.
printings: LEG, ME3
text: {2}, {T}: Exile the top card of your library face down.
  {0}: Sacrifice this artifact. If you do, discard your hand, then put all cards exiled with this artifact into their owner's hand.
  When this artifact leaves the battlefield, put all cards exiled with it into their owner's graveyard.
type: Artifact