Red and Purple leaders dominate the top tiers
It is important to note that you do not need both badges but I want to analyze the effect of simply being an Attendee as well as a competitor
The seven keywords, including reach, can all work together to make this a defensive and offensive creature at the same time
As these changes aren't formally happening until the Dominaria rules update, you'll have to wait until then to see the comprehensive list of what and how old cards will be affected by these changes, and Eli Shiffrin's Dominaria Update Bulletin will cover all of that later
Hopefully your doubts are in the past and your futures full of awesome Future Sight effects
Because damage remains marked on creatures until the damage is removed as the turn ends, nonlethal damage dealt to creatures you control while Porcelain Gallery is unlocked may become lethal if other creatures you control leave the battlefield during that turn