Six samurai deck have many potential among them is sealing your opponent spell and trap cards using both Shi En and Great Shogun Shien monsters first it force opponent to activate only one card per turn and if he activate his one card the other monster will negate it and destroy it plus if you control grandmaster and A force you could make an OTK by these 3monsters
Now how to summon them
First your opponent have on monster on filed the special summon elder of six samurai then normal summon Kagemusha after that you can special summon grandmaster and great Shogun now synchro summon Shien afterward activat A force to develop an OTK and your opponent can not do anything about it