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 - $248.100
Lightly Played - $198.500
Moderately Played - $173.700
Heavily Played - $148.900
Damaged - $124.100
Near Mint Spanish - $248.100
Lightly Played Spanish - $198.500
Moderately Played Spanish - $173.700
Heavily Played Spanish - $148.900
Damaged Spanish - $124.100