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 - $294.100
Lightly Played - $235.300
Moderately Played - $205.900
Heavily Played - $176.500
Damaged - $147.100
Near Mint Spanish - $294.100
Lightly Played Spanish - $235.300
Moderately Played Spanish - $205.900
Heavily Played Spanish - $176.500
Damaged Spanish - $147.100