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 - $137.40
Near Mint Non-English - $137.40
Lightly Played - $123.60
Lightly Played Non-English - $123.60
Played - $96.20
Played Non-English - $96.20
Heavily Played - $82.40
Heavily Played Non-English - $82.40
Damaged - $68.70
Damaged Non-English - $68.70