Knowledge Vault [Legends] Arena League 2004 you may have it fight

you may have it fight target creature

Set: From the Vault: Legends Type: Legendary Creature — Human Soldier Rarity: Mythic Cost: {2}{G}{W} {T}: Search your library for a legendary card

Set: Ravnica: City of Guilds Type: Land — Island Swamp Rarity: Rare ({T}: Add {U} or {B}

Set: Legends Type: Legendary Creature — Elder Dragon Rarity: Rare Cost: {2}{G}{G}{W}{W}{U}{U} Flying

Whenever Shield Sphere blocks

Knowledge Vault [Legends] Arena League 2004 you may have it fightSet: 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.