i've just done the hard badge with following card deck:4x ambush, 5x thief, 5x recruit, 5x guards, 5x mage, 5x pixies, 3x magic wall, 2x magic defense, 2x magic weapons, 5x add weapons/crystals/bricks, 5x builder, 2x house, 5x babylon, 2x wall, 5x school, 5x fence, 5x wain, 2x large wall, 2x trojan horse. if you don't have trojan horse then just leave it out, it should work though. good luck with it :)
 "ClickPLAY! Rainbow"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Castle Wars 2"){kind=icon}
 "Time Kufc"){kind=icon}
 "rlax"){kind=icon}