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}.
Near Mint - $99.60
Lightly Played - $89.70
Played - $69.80
Heavily Played - $59.80
Damaged - $49.80
Near Mint Non-English - $99.60
Lightly Played Non-English - $89.70
Played Non-English - $69.80
Heavily Played Non-English - $59.80
Damaged Non-English - $49.80