Duplicity
{3}{U}{U}
Enchantment
When ~this~ enters, exile the top five cards of your library face down.
At the beginning of your upkeep, you may exile all cards from your hand face down. If you do, put all other cards you own exiled with ~this~ into your hand.
At the beginning of your end step, discard a card.
When you lose control of ~this~, put all cards exiled with ~this~ into their owner's graveyard.
Gustha's Scepter
{0}
Artifact
{T}: Exile a card from your hand face down. You may look at it for as long as it remains exiled.
{T}: Return a card you own exiled with ~this~ to your hand.
When you lose control of ~this~, put all cards exiled with ~this~ into their owner's graveyard.
Knowledge Vault
{4}
Artifact
{2}, {T}: Exile the top card of your library face down.
{0}: Sacrifice ~this~. If you do, discard your hand, then put all cards exiled with ~this~ into their owner's hand.
When ~this~ leaves the battlefield, put all cards exiled with it into their owner's graveyard.