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 - $193.30
Lightly Played - $174.00
Moderately Played - $154.70
Heavily Played - $135.40
Damaged - $96.70
NM-Mint Non English - $193.30
Lightly Played Non English - $174.00
Moderately Played Non English - $154.70
Heavily Played Non English - $135.40
Damaged Non English - $96.70