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 - $76.25
Lightly Played - $72.50
Moderately Played - $61.00
Heavily Played - $45.75
Damaged - $38.25
Near Mint Non-English - $76.25
Lightly Played Non-English - $72.50
Moderately Played Non-English - $61.00
Heavily Played Non-English - $45.75
Damaged Non-English - $38.25