What they said above me is right .. It depends on your needs too, like you've said, you're running a Full-Blitz Team so i think, you must get Shichiseiken since it's main attributes are Attack and Critical, or get Leaf Fan that has main attributes of Ninjutsu and Critical .. In my case, i always using WaterMain and FireMain, that's why my primary choice of tools are Golden Rope for my 3 ninjas and Gourd for my Main .. I'm planning to get a Leaf Fan now for my FireMain and Barrier Ninja for the Nine Tails Invasion and Group's Summon Capture and Shichiseiken for Iruka, AsumaWB ..