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 - $108.60
Lightly Played - $86.90
Moderately Played - $76.10
Heavily Played - $65.20
Damaged - $54.30
Near Mint Spanish - $108.60
Lightly Played Spanish - $86.90
Moderately Played Spanish - $76.10
Heavily Played Spanish - $65.20
Damaged Spanish - $54.30