Unlike EX Pokemon, which were usually Basics regardless of if they're evolved or not, M Pokemon still needed to be evolved onto an existing EX Pokemon to play M Rayquaza EX, you needed a Rayquaza EX in play to evolve
Remember, I am only describing one small combo here, you have plenty more that can branch off with that, sometimes even to end with Crystal Wing Synchro Dragon, Stardust Dragon, and Titanic Galaxy with Solemn Scolding and Solemn Warning set
Remember what I said about being tempted by the ring
Orfeo, The Boulder An Unmovable Rock Just because a commander in Bracket 1 is intended to be more casual it doesn't mean you can't have a ton of fun with it
The top chase cards from this set are all Special Illustration Rares, with the striking Groudon topping the charts with a median value of nearly $70
I really recommend this article, sadly he does not cover all planned side deck changes for the most popular decks, but at least for the more difficult matchups where you are siding more for anyway