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 - $102.40
Lightly Played - $92.20
Moderately Played - $81.90
Heavily Played - $71.70
Damaged - $51.20
NM-Mint Non English - $102.40
Lightly Played Non English - $92.20
Moderately Played Non English - $81.90
Heavily Played Non English - $71.70
Damaged Non English - $51.20