Can you guys tune it down the power of the summoning in the 2nd round, fighting 2 summons (chameleon and dog of hell) with a 6k power toad aint fun, vs 16k power, it's not a matter of luck or strategy, eventually they'll overpower you.
Use Slash Myst whenever you can so you can do Standard Attack. Focus Dog of Hell first to prevent clones. If you use water cannon, Gamabunta will not do any Standard.