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 - $154.20
Near Mint Non-English - $154.20
Lightly Played - $138.80
Lightly Played Non-English - $138.80
Played - $108.00
Played Non-English - $108.00
Heavily Played - $92.60
Heavily Played Non-English - $92.60
Damaged - $77.10
Damaged Non-English - $77.10