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 - $66.25
Near Mint Non-English - $66.25
Lightly Played - $63.00
Lightly Played Non-English - $63.00
Moderately Played - $53.00
Moderately Played Non-English - $53.00
Heavily Played - $39.75
Heavily Played Non-English - $39.75
Damaged - $33.25
Damaged Non-English - $33.25