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 - $1,845.00
Near Mint Non-English - $1,845.00
Lightly Played - $1,660.50
Lightly Played Non-English - $1,660.50
Played - $1,291.50
Played Non-English - $1,291.50
Heavily Played - $1,107.00
Heavily Played Non-English - $1,107.00
Damaged - $922.50
Damaged Non-English - $922.50