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 - $102.75
Near Mint Non-English - $102.75
Lightly Played - $97.50
Lightly Played Non-English - $97.50
Moderately Played - $82.25
Moderately Played Non-English - $82.25
Heavily Played - $61.75
Heavily Played Non-English - $61.75
Damaged - $51.50
Damaged Non-English - $51.50