Knowledge Vault [Legends] RC12 This card gains 300 ATK

This card gains 300 ATK for every Guard Counter on it

If this card is in your Graveyard during your Main Phase

or with a Spell/Trap effect that could have targeted this card (except during the Damage Step): You can detach 1 Xyz Material from this card

Cannot be destroyed by battle

Knowledge Vault [Legends] RC12 This card gains 300 ATKSet: 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.