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 - $1,353.30
Near Mint Non-English - $1,353.30
Lightly Played - $1,218.00
Lightly Played Non-English - $1,218.00
Played - $947.30
Played Non-English - $947.30
Heavily Played - $812.00
Heavily Played Non-English - $812.00
Damaged - $676.70
Damaged Non-English - $676.70