Looking through my binder today, I came across an unlikely yet fun combo of Shifty and Grumpig. Grumpig's first attack, for no energies, confuses your opponent, and if they flip tails they get 6 damage counters instead of 3! Then, bring up Shiftry and use it's power, which says that any coin flip your opponent makes is a tails. This way they can never attack, and they take 6 damage counters every turn! The downside is that they can retreat away from it, though this can be stopped if you use a card to prevent retreating. Just an idea of a fun combo for league or weekly tournament.
~ Donezator