If I may make a suggestion, Zygarde, I think the font for the name of the Supporter isn't quite as bold and obvious as it probably should be. Perhaps a bold version of the same font? As for Yveltal, I don't think the Poké-Power is anywhere near as powerful as some of what we have in the format today. The full-HP rule is a nice touch. Coupled with the 1-at-a-time Legendary rule, you have a very balanced card. Consider Lost World, for example. People go crazy when they see "you may choose to win the game", but Lost World never ended up being overpowered in the slightest. I know the text is drastically different, but the theory is the same. If you have enough balancing factors, especially if your opponent can influence the result in some way (in this case, by not OHKOing it), it's not going to be the best card in format. I have a question as well – if Yveltal is OHKO'd as the last Prize your opponent takes, do we have a sudden death match, or does one activate before the other?