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 - $2,114.20
Lightly Played - $1,902.70
Played - $1,479.90
Heavily Played - $1,268.50
Damaged - $1,057.10
Near Mint Non-English - $2,114.20
Lightly Played Non-English - $1,902.70
Played Non-English - $1,479.90
Heavily Played Non-English - $1,268.50
Damaged Non-English - $1,057.10