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you may sacrifice a creature
Then look at the exiled cards and put them on top of your library in any order
destroy target land
When Hazezon leaves the battlefield
except it's a 4/4 black Zombie Cat with no mana cost
Knowledge Vault [Legends] Basic you may sacrifice a creatureSet: Legends Type: Artifact Rare Cost: {4} {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.