poison deck mtg commander Fynn, The Fangbearer INFECT / EDH Magic Ready-to-Play Karumonix, the Rat King

Is it changing the game in a major way

By printing the portrait of the cards characters into a golden doubloon, this showcase immediately gives newer players a hint of what Ixalan might be: a world of treasure, gold, and danger

Gavin Verhey specifically stated multiple times in this announcement that a lot of the terms of these tiers fall under feel. It is technically very possible to build an incredibly powerful Commander deck that falls under the deck construction rules of the Exhibition Tier, but these decks are specifically weaker than the average Commander precon according to the second tier

Need to draw more cards off your Orrery

Lets dive into the 0s and 1s of MTG

This is a Five Color (the format) essential