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 - $215.00
Near Mint Non-English - $215.00
Lightly Played - $204.25
Lightly Played Non-English - $204.25
Moderately Played - $172.00
Moderately Played Non-English - $172.00
Heavily Played - $129.00
Heavily Played Non-English - $129.00
Damaged - $107.50
Damaged Non-English - $107.50