In a nice flavorful touch, these also grant a class to the equipped creature, mimicking the Final Fantasy job system
Colorless is the best option unless you want to get pretty heavy into discard
Scenario #2: Changes to game-changers (possibly tier rebalance too) I think theres going to be some cards added to this list, and some clear statements about how many of each can be on the different tiers
If an effect instructs a player to name a card, the player may name either face of a double-faced card but not both
There arent any sealed products specific to this subset, so its ranking here is entirely due to the popularity of its singleswhich should give you a sense of how much demand theyre in
They have good reason to fear to, as the exact same scenario happened fairly recently with the release of Oko, Thief of Crowns in Throne of Eldraine