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 - $75.50
Lightly Played - $68.00
Moderately Played - $60.40
Heavily Played - $52.90
Damaged - $37.80
NM-Mint Non English - $75.50
Lightly Played Non English - $68.00
Moderately Played Non English - $60.40
Heavily Played Non English - $52.90
Damaged Non English - $37.80