name: Knowledge Vault
originalText: {2}, {T}: Exile the top card of your library face down. 
  {0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards exiled with Knowledge Vault into their owner's hand.
  When Knowledge Vault leaves the battlefield, put all cards exiled with Knowledge Vault into their owner's 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