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 - $62.50
Near Mint Non-English - $62.50
Lightly Played - $59.50
Lightly Played Non-English - $59.50
Moderately Played - $50.00
Moderately Played Non-English - $50.00
Heavily Played - $37.50
Heavily Played Non-English - $37.50
Damaged - $31.25
Damaged Non-English - $31.25