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 - $1.568.200
Lightly Played - $1.254.600
Moderately Played - $1.097.800
Heavily Played - $940.900
Damaged - $784.100
Near Mint Spanish - $1.568.200
Lightly Played Spanish - $1.254.600
Moderately Played Spanish - $1.097.800
Heavily Played Spanish - $940.900
Damaged Spanish - $784.100