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 - $89.20
Near Mint Non-English - $89.20
Lightly Played - $80.20
Lightly Played Non-English - $80.20
Played - $62.40
Played Non-English - $62.40
Heavily Played - $53.50
Heavily Played Non-English - $53.50
Damaged - $44.60
Damaged Non-English - $44.60