MAGIC: THE GATHERING
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.
This Cube, Commander, and Vintage staple is one of the best mana rocks of all time. It fits into a variety of decks, ramping out powerful spells in the early turns of the game.