Knowledge Vault [Legends] Nightmare Demon Spend this mana only to

Spend this mana only to activate abilities of artifacts

Set: Modern Masters 2015 Tokens Type: Token Creature — Snake Rarity: Common

Set: Planechase 2012 Type: Creature — Cleric Rarity: Uncommon Cost: {5}{G} When Brutalizer Exarch enters the battlefield

Target creature can't be blocked this turn

Return a land you control to its owner's hand: Target player mills two cards

Knowledge Vault [Legends] Nightmare Demon Spend this mana only 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.