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 - $336.60
Lightly Played - $269.30
Moderately Played - $235.70
Heavily Played - $202.00
Damaged - $168.30
Near Mint Spanish - $336.60
Lightly Played Spanish - $269.30
Moderately Played Spanish - $235.70
Heavily Played Spanish - $202.00
Damaged Spanish - $168.30