Ray, Star of Hope

Whenever an artifact you control is exiled from anywhere you may draw a card, if you do discard a card.

{x}: Discover X. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 5 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)