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 - $1,890.00
Near Mint Non-English - $1,890.00
Lightly Played - $1,795.50
Lightly Played Non-English - $1,795.50
Moderately Played - $1,512.00
Moderately Played Non-English - $1,512.00
Heavily Played - $1,134.00
Heavily Played Non-English - $1,134.00
Damaged - $945.00
Damaged Non-English - $945.00