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 - $58.70
Lightly Played - $55.70
Moderately Played - $52.80
Heavily Played - $46.90
Damaged - $38.10
NM-Mint Non English - $58.70
Lightly Played Non English - $55.70
Moderately Played Non English - $52.80
Heavily Played Non English - $46.90
Damaged Non English - $38.10