With the latest discussions of basics being too powerful, maybe it would be good to add another benefit to evolving. Currently, evolutions get to remove special conditions, usually have some more hp, but maybe there should be some other advantage to even out the fact that evolutions require more cards in your deck. One thing that occured to me is to automatically heal a certain amount of damage when a Pokemon evolves. Might not be that helpful in this OHKO-heavy format, but it is an idea. Any others?