Since you get to choose what card you discard, you can get rid of a GX or EX Pokemon in your hand, so there's no risk of it getting knocked out on the Bench, and Mewtwo and Mew-GX can take advantage of its attacks
Simic Ouroboroid (7 players) : With Llanowar Elves, Gene Pollinator, and Badgermole Cub accelerating its early turns, this deck floods the battlefield with cheap creatures while ramping into an Ouroboroid
Begin by exerting a character of your choice, and choose an exerted character card controlled by your opponent to be your target
Which ones we chose was partially based on what could conceivably exist on Kaladesh, but also on trying to find things that some subset of players would be happy with
Other than that, the end step is a very straightforward step: You get priority, can perform any instant-speed action, and everything happens like in other phases