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 - $58.20
Lightly Played - $52.40
Played - $40.80
Heavily Played - $35.00
Damaged - $29.10
Near Mint Non-English - $58.20
Lightly Played Non-English - $52.40
Played Non-English - $40.80
Heavily Played Non-English - $35.00
Damaged Non-English - $29.10