Knowledge Vault is a uncommon Artifact card from Magic: The Gathering (Masters Edition III, ME3).
Uncommon
Masters Edition III (ME3)
{4}
Mana Value
4
Card 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.
