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 - $206.50
Near Mint Non-English - $206.50
Lightly Played - $196.00
Lightly Played Non-English - $196.00
Moderately Played - $165.25
Moderately Played Non-English - $165.25
Heavily Played - $124.00
Heavily Played Non-English - $124.00
Damaged - $103.25
Damaged Non-English - $103.25