User blog comment:B214/Question and Answers/@comment-37.15.213.227-20140109145816/@comment-1359322-20140109150600

Anyone is compatible with any type of Evil Piece but no one would do that since if you choose a wrong compatibility, the ability of the servant would decrease. Like you choose a Speed type warrior with a Bishop which is mainly for the Magic type, then the warrior's ability can't be used to the fullest.