Knowledge Vault [Legends] Return to Ravnica Whenever an opponent casts a

Whenever an opponent casts a noncreature spell

Supplicants offer flesh and silver

The *Weatherlight* dragged the *Predator* behind it

Set: Antiquities Type: Artifact Rarity: Uncommon Cost: {2} {2}

Knowledge Vault [Legends] Return to Ravnica Whenever an opponent casts aSet: Legends Type: Artifact Rarity: 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.