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}.
NM-Mint - $5,342.80
NM-Mint Non English - $5,342.80
Lightly Played - $5,075.70
Lightly Played Non English - $5,075.70
Moderately Played - $4,808.60
Moderately Played Non English - $4,808.60
Heavily Played - $4,274.30
Heavily Played Non English - $4,274.30
Damaged - $3,472.90
Damaged Non English - $3,472.90