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}.
NM-Mint - $86.50
Lightly Played - $77.90
Moderately Played - $69.20
Heavily Played - $60.60
Damaged - $43.30
NM-Mint Non English - $86.50
Lightly Played Non English - $77.90
Moderately Played Non English - $69.20
Heavily Played Non English - $60.60
Damaged Non English - $43.30