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 - $2,362.50
Lightly Played - $2,126.30
Moderately Played - $1,890.00
Heavily Played - $1,653.80
Damaged - $1,181.30
NM-Mint Non English - $2,362.50
Lightly Played Non English - $2,126.30
Moderately Played Non English - $1,890.00
Heavily Played Non English - $1,653.80
Damaged Non English - $1,181.30