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 - $1,697.90
Near Mint Non-English - $1,697.90
Lightly Played - $1,528.10
Lightly Played Non-English - $1,528.10
Played - $1,188.60
Played Non-English - $1,188.60
Heavily Played - $1,018.80
Heavily Played Non-English - $1,018.80
Damaged - $849.00
Damaged Non-English - $849.00