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 - $276.10
Near Mint Non-English - $276.10
Lightly Played - $248.50
Lightly Played Non-English - $248.50
Played - $193.30
Played Non-English - $193.30
Heavily Played - $165.70
Heavily Played Non-English - $165.70
Damaged - $138.10
Damaged Non-English - $138.10