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 - $91.00
Near Mint Non-English - $91.00
Lightly Played - $86.50
Lightly Played Non-English - $86.50
Moderately Played - $72.75
Moderately Played Non-English - $72.75
Heavily Played - $54.50
Heavily Played Non-English - $54.50
Damaged - $45.50
Damaged Non-English - $45.50