Knowledge Vault
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{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.
What it does
Tagged as Sac outlet — the jobs the deck report counts it toward.
Official rulings
- You can activate the second ability any time you have priority, including in response to itself. However, you will only be able to sacrifice the Vault as the first such ability resolves. (2008-10-01)
- If you activate Knowledge Vault's second ability, all that happens at that time is that you pay a cost of {0}. As the ability resolves, you must sacrifice Knowledge Vault. This is mandatory. If you are able to do so, you discard your hand and put all cards exiled with Knowledge Vault into their owners' hands. If you aren't able to do so because Knowledge Vault left the battlefield or changed controllers before the ability resolves, nothing happens. (2009-10-01)
- You don't get to look at the cards exiled with Knowledge Vault. (2009-10-01)
Printings & prices
Every set Knowledge Vault has been printed in, with the art, the finishes and the market price of each — the headline price above is the cheapest of these.
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