So creative!! The strategy of thinking about what you do to the enemy knowing that it will come back to you is insane! I managed to win the game after some tries, it's very addictive an fun.
There's a cheese strat in which you can just not play any card and end a turn to make the enemy loose the shield if you've played a "gain 10 shield until the end of your turn". This could be fixed by restricting the "End Turn" button to at least playing one card.