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 - $90.20
Near Mint Non-English - $90.20
Lightly Played - $81.20
Lightly Played Non-English - $81.20
Played - $63.20
Played Non-English - $63.20
Heavily Played - $54.10
Heavily Played Non-English - $54.10
Damaged - $45.10
Damaged Non-English - $45.10