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 - $42.75
Lightly Played - $40.75
Moderately Played - $34.25
Heavily Played - $28.00
Damaged - $21.50
Near Mint Non-English - $42.75
Lightly Played Non-English - $40.75
Moderately Played Non-English - $34.25
Heavily Played Non-English - $28.00
Damaged Non-English - $21.50