Masters Edition III

Knowledge Vault

{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.

Legends

o2oc
T: 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.