Arn, Chaos Ascendant

Whenever Arn, Chaos Ascendant enters the battlefield, you may reveal up to three cards of
your choice from your hand.
{t}, pay 1 life: discard a revealed card: Randomly
search your library for a card with a card with a converted mana cost equal to or less than the discarded card, cast it without paying the mana
cost, shuffle your library. Activate this ability as a sorcery.