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 - $50.50
Lightly Played - $45.40
Played - $35.30
Heavily Played - $30.30
Damaged - $25.20
Near Mint Non-English - $50.50
Lightly Played Non-English - $45.40
Played Non-English - $35.30
Heavily Played Non-English - $30.30
Damaged Non-English - $25.20