Magic: the Gathering (MTG) Artifact card from Masters Edition IV courtesy of Deckmaster
Mana Vault doesn't untap during your untap step. At the beginning of your upkeep, you may pay . If you do, untap Mana Vault. At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you. : Add to your mana pool.
214 ME4 • ENMark Tedin
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Legal in: Freeform,Prismatic,Commander
Deckmaster
Masters Edition IV Mightstone > < Mana Matrix
(CMC:1)
. If you do, untap Mana Vault.
At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you.
: Add 
Mark Tedin