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 - $206.80
Lightly Played - $186.20
Moderately Played - $165.50
Heavily Played - $144.80
Damaged - $103.40
NM-Mint Non English - $206.80
Lightly Played Non English - $186.20
Moderately Played Non English - $165.50
Heavily Played Non English - $144.80
Damaged Non English - $103.40