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 - $221,500
Lightly Played - $177,200
Moderately Played - $155,000
Heavily Played - $132,900
Damaged - $110,800
Near Mint Spanish - $221,500
Lightly Played Spanish - $177,200
Moderately Played Spanish - $155,000
Heavily Played Spanish - $132,900
Damaged Spanish - $110,800