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 - $73.60
Lightly Played - $66.30
Moderately Played - $58.90
Heavily Played - $51.60
Damaged - $36.80
NM-Mint Non English - $73.60
Lightly Played Non English - $66.30
Moderately Played Non English - $58.90
Heavily Played Non English - $51.60
Damaged Non English - $36.80