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 - $92.20
Near Mint Non-English - $92.20
Lightly Played - $83.00
Lightly Played Non-English - $83.00
Played - $64.60
Played Non-English - $64.60
Heavily Played - $55.30
Heavily Played Non-English - $55.30
Damaged - $46.10
Damaged Non-English - $46.10