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 - $166.80
Near Mint Non-English - $166.80
Lightly Played - $150.10
Lightly Played Non-English - $150.10
Played - $116.70
Played Non-English - $116.70
Heavily Played - $100.10
Heavily Played Non-English - $100.10
Damaged - $83.40
Damaged Non-English - $83.40