"It seems like Satan has thrown the DH into our game"

This quote by Andy Van Slyke is referring to the introduction of the Designated Hitter (DH) rule in Major League Baseball. The DH rule permits a group to have a player in the lineup who does not play in the field, however instead just bats. Van Slyke is revealing his annoyance with the guideline, recommending that it has actually been required upon the game by a malevolent force, in this case Satan. He implies that the DH guideline has taken away from the standard video game of baseball, and that it has been troubled the game without the permission of the gamers or fans. Van Slyke's quote is a funny method of expressing his discontentment with the DH guideline, and his belief that it has actually been required upon the game with no genuine advantage.