In Keller, the Angels add another reliever who can get plenty of swings and misses from batters. He posted a 3.38 ERA for the Marlins last season and should be in the mix for a spot in LA's bullpen this year.

The Marlins recently designated Keller for assignment, so they did well to land Estrada in this deal. Estrada, 19, is a long-range catching prospect with pretty good upside. This is a solid deal for the Fish.

Could Keller become a fantasy option in 2020? Yes. Is he worth drafting? No. Keep an eye on him during spring training to see how he progresses and look to add him during the campaign if he becomes an integral part of the Halos' bullpen. As for Estrada, he is a long-range prospect and is currently off the fantasy radar.