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 - $122.30
Near Mint Non-English - $122.30
Lightly Played - $110.10
Lightly Played Non-English - $110.10
Played - $85.60
Played Non-English - $85.60
Heavily Played - $73.40
Heavily Played Non-English - $73.40
Damaged - $61.20
Damaged Non-English - $61.20