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 - $47.600
Lightly Played - $38.100
Moderately Played - $33.300
Heavily Played - $28.600
Damaged - $23.800
Near Mint Spanish - $47.600
Lightly Played Spanish - $38.100
Moderately Played Spanish - $33.300
Heavily Played Spanish - $28.600
Damaged Spanish - $23.800