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 - $87.80
Near Mint Non-English - $87.80
Lightly Played - $79.10
Lightly Played Non-English - $79.10
Played - $61.50
Played Non-English - $61.50
Heavily Played - $52.70
Heavily Played Non-English - $52.70
Damaged - $43.90
Damaged Non-English - $43.90