【无所不用其极】〖wú su bù yòng qí jí〗[resort to every conceivable means; employ the meanest of tricks; go to any length; pursue everything to its brutal end]

无洞掘蟹找岔子，

所思匪夷白费力。

不择手段耍花招，

用尽心机施诡计。

其势汹汹来凶猛，

极奸巨恶干坏事。

无处不用尽心力。指做坏事时任何极端的手段都使出来。Anyplace all use up mental strength. Refers when do something bad whatever extreme of means all use come out.