Knowledge Vault [Legends] BW99 you gain life equal to

you gain life equal to the life lost this way

Set: Magic Player Rewards 2009 Type: Instant Rarity: Rare Cost: {1}{U}{U}{U} Choose two —

Metal Rarity: Ultra Rare Retreat cost: Colorless

Set: Black & White: Black Star Promos Type: Item Rarity: Promo

You may reveal a creature card from among them and put it into your hand

Knowledge Vault [Legends] BW99 you gain life equal toSet: 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.