Board Thread:Questions and Answers/@comment-205.213.134.253-20140122154854/@comment-5688820-20140124055318

not cost but their power for each color tile if you have both of them at max level it will be randomly pick up for you, if they are not in the same level storm will always go because her blue stats is higher...

but espionage should work if you team up both of them for either purple or black match...