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 - $37.80
Lightly Played - $35.90
Moderately Played - $34.00
Heavily Played - $30.20
Damaged - $24.60
NM-Mint Non English - $37.80
Lightly Played Non English - $35.90
Moderately Played Non English - $34.00
Heavily Played Non English - $30.20
Damaged Non English - $24.60