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 - $89.10
Lightly Played - $80.20
Moderately Played - $71.30
Heavily Played - $62.40
Damaged - $44.60
NM-Mint Non English - $89.10
Lightly Played Non English - $80.20
Moderately Played Non English - $71.30
Heavily Played Non English - $62.40
Damaged Non English - $44.60