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 - $2,806.25
Near Mint Non-English - $2,806.25
Lightly Played - $2,666.00
Lightly Played Non-English - $2,666.00
Moderately Played - $2,245.00
Moderately Played Non-English - $2,245.00
Heavily Played - $1,683.75
Heavily Played Non-English - $1,683.75
Damaged - $1,403.25
Damaged Non-English - $1,403.25