Rondon was a Rule 5 pick that the Cubs snagged from the Indians in 2012. He then spent the next five years as a member of the Cubs bullpen. He became the closer in 2014 and held that role until Aroldis Chapman was acquired. He did a decent job the first two years, but has not been very consistent since 2016. I don't think the Cubs are going to be any worse off without him.
As a bullpen guy, he was in just a limited number of sets. Over the five years with the Cubs, I've got just 20 of his cards.