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 - $1,264.75
Near Mint Non-English - $1,264.75
Lightly Played - $1,201.50
Lightly Played Non-English - $1,201.50
Moderately Played - $1,012.00
Moderately Played Non-English - $1,012.00
Heavily Played - $759.00
Heavily Played Non-English - $759.00
Damaged - $632.50
Damaged Non-English - $632.50