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 - $91.100
Lightly Played - $72.900
Moderately Played - $63.800
Heavily Played - $54.700
Damaged - $45.600
Near Mint Spanish - $91.100
Lightly Played Spanish - $72.900
Moderately Played Spanish - $63.800
Heavily Played Spanish - $54.700
Damaged Spanish - $45.600