I too was able to auto it in a team of 3, it took me several tries to figure it out, but yea it is doable on auto.

I will upload a video to a new youtube account tomorrow, and hopefully it wont take too long to upload it... slow internet is slow. Either way for now: A few tips, A screenshot and talents used:

1. Every team should have a healer.

2. The most important thing I can think of is just make sure your tanky team is in the middle, and have someone like kisame/danzo in that tanky team, as both of them help a lot in stopping more damage coming your way in round 3, and make sure jigokudo is alive in round 4. (If he dies it goes south far easier in round 4)

The first set of ninjas, and the second set is pretty much a tank and spank there is nothing special there, round 3 is honestly the toughest part of this SA, sure round 4 can be a little tricky, but yea... round 3 is rougher.

BP - 65K - 72k

Wind Main Talents: 3, 2, 4, 3, 4 - Gold Snake Summon

Fire Main Talents: (Side note did it on auto with this exact team as a water main same setup... different skills for main obviously) : TALENTS: 2, 4, 4, 4, 3 - Gold Dog Summon

Water Main: 3, 2, 1, 1, 1 - Gold Tiger

-

I hope this helps people and maybe they can even tweak it to make it work for them. (I also realize I got real lucky with some of the ninjas I used, as have my friends Shuraka, and Kenihara, but I assure you none of these are insane P2W ninjas, and there are a few ninjas you could try subbing in... if you don't have a couple of these ninjas, just play around a little bit and pay attention to what each of the ninjas do... if they don't do something very similar... expect to fail.) Like for example if you need to replace Danzo, try to replace him with someone like Onoki in the exact same position. (Both have a strong potential to stop unwanted damage in round 3, and of course if you replace a ninja be sure to tweak your main skills as well to make sure you get full combos throughout.)