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 - $67.00
Near Mint Non-English - $67.00
Lightly Played - $63.50
Lightly Played Non-English - $63.50
Moderately Played - $53.50
Moderately Played Non-English - $53.50
Heavily Played - $40.25
Heavily Played Non-English - $40.25
Damaged - $33.50
Damaged Non-English - $33.50