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 - $90.40
Lightly Played - $81.40
Moderately Played - $72.30
Heavily Played - $63.30
Damaged - $45.20
NM-Mint Non English - $90.40
Lightly Played Non English - $81.40
Moderately Played Non English - $72.30
Heavily Played Non English - $63.30
Damaged Non English - $45.20