This randomnes seems to be getting out of hand though. Yesterday I lost about 12 out of 18 battles when I was leading in pillz and character level in most of my battles. Imagine Tanareava with 6 pillz beaten by Ogon Kyu with no pillz. This did not happen to me once or twice but I counted 8 times against characters lower in level than mine.
You will never have a 100% success because game calculates fights using random numbers and probability algorithms
you play a card with 8 power and using 4 pilz, you have a 32 (8x4) attack
your opponent plays a card with 2 power and 1 pilz, he has a 2 (2x1) attack
global attack is 34 ((32 2)
you have a great winning chance 32/34 (94,12%), but your opponent can win too because he has a little winning hope 2/34 (5,88%)