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}.
Near Mint - $83.50
Lightly Played - $75.20
Played - $58.50
Heavily Played - $50.10
Damaged - $41.80
Near Mint Non-English - $83.50
Lightly Played Non-English - $75.20
Played Non-English - $58.50
Heavily Played Non-English - $50.10
Damaged Non-English - $41.80