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 - $127.25
Near Mint Non-English - $127.25
Lightly Played - $120.75
Lightly Played Non-English - $120.75
Moderately Played - $101.75
Moderately Played Non-English - $101.75
Heavily Played - $76.25
Heavily Played Non-English - $76.25
Damaged - $63.75
Damaged Non-English - $63.75