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 - $104.00
Near Mint Non-English - $104.00
Lightly Played - $98.75
Lightly Played Non-English - $98.75
Moderately Played - $83.25
Moderately Played Non-English - $83.25
Heavily Played - $62.50
Heavily Played Non-English - $62.50
Damaged - $52.00
Damaged Non-English - $52.00