The point is to have the Game Changers list be used as a halfway point between legal cards and banned cards, and it creates a curated format where some arguably-bannable cards can appear
Morph and disguise are technically compatible, but imagine playing a game where both mechanics are featured, and potentially both types of face-down cards are on the battlefield at the same time
Cloud, Midgar Mercenary BPhillipYork: Really solid utility creature
With many of Sapphires powers, youll be able to quickly amass a horde of ink resources to play whatever you need, making it a great color for lots of decks
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, return target creature card from your graveyard to the battlefield
Mastery of the game is not something that can happen overnight