Edo Tensei. One person can control an army that takes multiple nations to defeat.
As well as the Juitsu in chapter 560 and 561. The juitsu is dropping a mountain size rock on heaps of ninja. It took the combined full effort of the Kazekage and the Tsuchikage to stop one of them. Then the guy who dropped it (not spoiling it) just simply dropped another on top of it this then killed hundreds of ninja and nearly killed even more (including the Tsuchikage).
Then the same guy a few chapters later used a wood release juitsu that was big enough to attack an army of several 1000 ninja were all in danger at once and were nearly powerless to stop it.