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 - $85,700
Lightly Played - $68,600
Moderately Played - $60,000
Heavily Played - $51,400
Damaged - $42,900
Near Mint Spanish - $85,700
Lightly Played Spanish - $68,600
Moderately Played Spanish - $60,000
Heavily Played Spanish - $51,400
Damaged Spanish - $42,900