Yuvia, Protector of Thune

Flying, Indestructible, Lifelink
Life Force - Whenever you gain life from Lifelink, look at the top X cards of your library, where X is the amount of life gained.
You may reveal a creature card from among them with converted mana cost X or less and put it
onto the battlefield. Put the rest on the bottom
of your library in any order.

"What is nature without life?"