Jester, Traveler's Trickster

Whenever you cast a spell with converted mana cost
4 or less, you gain life equal to that spells mana cost.

Invoke Duplicity —{u}{u}{t}: Choose target spell. Its controller shuffles it into their library, then reveals
cards from the top of their library until they reveal a
land card. They may play it, if they do, it enters the battlefield tapped. Put the rest on the bottom of their library in a random order.