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 - $91.20
Lightly Played - $82.00
Played - $63.80
Heavily Played - $54.70
Damaged - $45.60
Near Mint Non-English - $91.20
Lightly Played Non-English - $82.00
Played Non-English - $63.80
Heavily Played Non-English - $54.70
Damaged Non-English - $45.60