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 - $87.10
Near Mint Non-English - $87.10
Lightly Played - $78.40
Lightly Played Non-English - $78.40
Played - $61.00
Played Non-English - $61.00
Heavily Played - $52.30
Heavily Played Non-English - $52.30
Damaged - $43.60
Damaged Non-English - $43.60