Sunleaf, first of his kind

Flying
Whenever Sunleaf, first of his kind deals combat
damage to a player, that player may search their library for a basic forest and put it onto the battlefield. If they do, you may also search your library for a basic forest and put it on the battlefield. If a library was searched this way, that player shuffles. If they don't search their library
for a basic forest, gain life equal to the number of forests you control.