Knowledge Vault [Legends] RC12 If this card is in

If this card is in your Graveyard during your Main Phase

This card gains 300 ATK for every Guard Counter on it

Set: Cybernetic Revolution Card type: Field Spell Card Rarity: Ultimate Rare When a monster that includes Elemental Hero in its card name attacks

Cannot be destroyed by battle

Knowledge Vault [Legends] RC12 If this card is inSet: 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.