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 - $56.820
Near Mint Spanish - $56.820
Lightly Played - $51.140
Lightly Played Spanish - $51.140
Moderately Played - $42.620
Moderately Played Spanish - $42.620
Heavily Played - $34.100
Heavily Played Spanish - $34.100
Damaged - $22.730
Damaged Spanish - $22.730