Maybe a bonus? Such as fury: + 3 power? Would make some good 2/3HKO combos. Of course, with high power after a fury the card would have to have low base stats for the star count.
We'll use a 3* 8/1 Defeat: 3/4 pillz and a 5* 6/6 + 1 power and damage
If you win with furying and 1 pillz with the 3 star ( 4 pillz ) You get in 3 damage, if you lose you get 3 pillz back! But if you win, use the 5 star furied and the rest of your pillz if on the first round your opp used enough pillz for you to win, it would be 10 power anyway.