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 - $103.40
Lightly Played - $93.10
Moderately Played - $82.70
Heavily Played - $72.40
Damaged - $51.70
NM-Mint Non English - $103.40
Lightly Played Non English - $93.10
Moderately Played Non English - $82.70
Heavily Played Non English - $72.40
Damaged Non English - $51.70