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 - $185.70
Lightly Played - $167.20
Moderately Played - $148.60
Heavily Played - $130.00
Damaged - $92.90
NM-Mint Non English - $185.70
Lightly Played Non English - $167.20
Moderately Played Non English - $148.60
Heavily Played Non English - $130.00
Damaged Non English - $92.90