Even if people attack level 1's for some reason, its VERY unlikely you will lose having 5 cards of the same type unless you accidentally attacked the wrong type of cards. Remember there's no SED boosting cards in this event. First I was attacking level 1's because I thought they give more ranking points but then I tested level 5's and it was the same so I switched to lowbies, but I never lost a fight vs level 1's. If you are aware of your support card, there's almost 0 chance that you will lose :P