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 - $2,117.30
Lightly Played - $1,905.60
Played - $1,482.10
Heavily Played - $1,270.40
Damaged - $1,058.70
Near Mint Non-English - $2,117.30
Lightly Played Non-English - $1,905.60
Played Non-English - $1,482.10
Heavily Played Non-English - $1,270.40
Damaged Non-English - $1,058.70