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 - $259.80
Lightly Played - $233.90
Played - $181.90
Heavily Played - $155.90
Damaged - $129.90
Near Mint Non-English - $259.80
Lightly Played Non-English - $233.90
Played Non-English - $181.90
Heavily Played Non-English - $155.90
Damaged Non-English - $129.90