The Doctrine and Covenants

Tap, pay 2 life: Draw a card. If it’s a non-creature Mission card, you may reveal it and put it into your
hand. If it's a Missionary creature card, you may sacrifice a creature you control, then play the Missionary Creature card without paying its mana
cost.
"Search diligently, pray always, and be believing, and
all things shall work together for your good."
—Doctrine and Covenants 90:24