Mana Vault [Fourth Edition (Foreign Black Border)] 000 and you can place at

and you can place at most one tile on a habitat

exile cards from the top of your library until you exile a nonland card that costs less

000 Type: Instant Rarity: Common Cost: {B} Prevent all combat damage that would be dealt this turn

and no matter which House you prefer to play

sacrifice a creature with power 4 or greater

Mana Vault [Fourth Edition (Foreign Black Border)] 000 and you can place atSet: Fourth Edition (Foreign Black Border) Type: Artifact Rarity: Rare Cost: {1} Mana Vault doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault. At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you. {T}: Add {C}{C}{C}.