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 - $311.90
Lightly Played - $249.50
Moderately Played - $218.30
Heavily Played - $187.20
Damaged - $156.00
Near Mint Spanish - $311.90
Lightly Played Spanish - $249.50
Moderately Played Spanish - $218.30
Heavily Played Spanish - $187.20
Damaged Spanish - $156.00