Marincin has played in two NHL games so far this season with two penalty minutes.
The 21-year-old has three goals, four assists and a plus-5 rating in 24 games with the American Hockey League's Oklahoma City Barons this season.
Horak will be making his first appearance with the Oilers.
Horak has five goals and 13 assists with a minus-5 rating over 82 NHL games with Calgary. He has five goals, six assists and a minus-2 rating with Oklahoma City this season.