Jyn Altier, Hand of Trovia

Whenever you gain life, put a +1/+1 counter on
Jyn Altier, Hand of Trovia.
Whenever one or more cards are exiled, you gain
life equal to the greatest converted mana cost
among those cards.
When Jyn attacks, exile the top X cards of your library, where X is its power. You may cast those
cards this turn.