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 - $278.80
Near Mint Non-English - $278.80
Lightly Played - $250.90
Lightly Played Non-English - $250.90
Played - $195.20
Played Non-English - $195.20
Heavily Played - $167.30
Heavily Played Non-English - $167.30
Damaged - $139.40
Damaged Non-English - $139.40