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 - $115.50
Near Mint Non-English - $115.50
Lightly Played - $109.75
Lightly Played Non-English - $109.75
Moderately Played - $92.50
Moderately Played Non-English - $92.50
Heavily Played - $69.50
Heavily Played Non-English - $69.50
Damaged - $57.75
Damaged Non-English - $57.75