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 - $183.200
Lightly Played - $146.600
Moderately Played - $128.300
Heavily Played - $109.900
Damaged - $91.600
Near Mint Spanish - $183.200
Lightly Played Spanish - $146.600
Moderately Played Spanish - $128.300
Heavily Played Spanish - $109.900
Damaged Spanish - $91.600