For those stuck on ninja: I defeated with icecream. Looks like white-blue dragons are best against it.
recap :Ah defeated Troll with a Red/Green. epic Life BM++
thnx Buddies
leopard with Trickster 10.
Prism I used a Diamond
Naga I used a Lotus
Ninja I used Air 1
Got naga on the second try with lotus BB++ after it lost the first time (also lost troll, pearl, emerald, athletic, midas, moon, and onyx).
Round 26 epic Forestfire beat Troll Lv 18, attacks was BBM, I think should used Magic attack first than bash,anyway won the battle and move on to next round,Thank you everyone for support.