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 - $89.90
Near Mint Non-English - $89.90
Lightly Played - $80.90
Lightly Played Non-English - $80.90
Played - $63.00
Played Non-English - $63.00
Heavily Played - $54.00
Heavily Played Non-English - $54.00
Damaged - $45.00
Damaged Non-English - $45.00