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 - $2,028.60
Lightly Played - $1,825.70
Played - $1,420.00
Heavily Played - $1,217.20
Damaged - $1,014.30
Near Mint Non-English - $2,028.60
Lightly Played Non-English - $1,825.70
Played Non-English - $1,420.00
Heavily Played Non-English - $1,217.20
Damaged Non-English - $1,014.30