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 - $200.60
Lightly Played - $180.50
Moderately Played - $160.50
Heavily Played - $140.40
Damaged - $100.30
NM-Mint Non English - $200.60
Lightly Played Non English - $180.50
Moderately Played Non English - $160.50
Heavily Played Non English - $140.40
Damaged Non English - $100.30