In play, the 1-cost card would require some strategy to make it truly become one of the sets best cards, but could be a valuable low-cost card
Like most Pokmon cards, the value of Mega Gardevoir ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Mega Evolution)
As I write this, Im seeing that Ho-Oh has also returned to the game as a legendary raid boss, and its also now available as a shiny, though Im not sure at what spawn rate
But it might be tough to always have something that is damaged for you to challenge
Any interesting legends to build around
In a multiplayer game, each opponent in turn order makes all of their choices, then all of the actions occur simultaneously