The Crystal Dome

When The Crystal Dome comes into play, you
may reveal a Spirit, Shapeshifter, Elemental, Illusion, Sphinx, or card with Tether in your
hand. If you do not, it comes into play tapped.
Pay 1 life, {t}: Add 1 mana of any color to your
mana pool. If this mana is used to cast an instant spell, that spell has Hexproof.
{t}: Add {1} to your mana pool.