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 - $80.810
Lightly Played - $72.730
Moderately Played - $60.610
Heavily Played - $48.490
Damaged - $32.330
Near Mint Spanish - $80.810
Lightly Played Spanish - $72.730
Moderately Played Spanish - $60.610
Heavily Played Spanish - $48.490
Damaged Spanish - $32.330