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 - $105.80
Lightly Played - $95.20
Played - $74.10
Heavily Played - $63.50
Damaged - $52.90
Near Mint Non-English - $105.80
Lightly Played Non-English - $95.20
Played Non-English - $74.10
Heavily Played Non-English - $63.50
Damaged Non-English - $52.90