Knowledge Vault

Artifact -
{2}, {T}: Remove the top card of your library from the game face down. <CR>
{0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards removed from the game with Knowledge Vault into their owner's hand. <CR>
When Knowledge Vault leaves play, put all cards removed from the game with Knowledge Vault into their owner's graveyard.

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

Artifact -
When Knowledge Vault leaves play, put all cards removed from the game with Knowledge Vault into their owner's graveyard at end of turn. <CR>
{2}, {T}: Remove the top card of your library from the game face down. <CR>
Sacrifice Knowledge Vault: Discard your hand, then put all cards removed from the game with Knowledge Vault into their owner's hand.

Artifact -
{2}, {T}: Remove the top card of your library from the game face down. <CR>
{0}: Sacrifice Knowledge Vault. If you do, discard your hand, then put all cards removed from the game with Knowledge Vault into their owner's hand. <CR>
When Knowledge Vault leaves play, put all cards removed from the game with Knowledge Vault into their owner's graveyard.