If they have characters totalling 7 ink on board, they could sing Beyond the Horizon next turn to ruin your hand, so be ready
Thats true of most of the cycle, but this one doesnt affect the game state at all, and the set has little else to support a mill engine
So it would keep that +x forever, and gain even more whenever it challenges again
One thing to be aware of is that you may pull some Commander-only cards out of Collector Booster packs, so you'll want to check the set symbols before building Standard decks
Some stores will have more competitive players and might give out prizing differently
As mentioned, choosing your favourite characters is perfectly fine, and youll still have a functional deck even if youre picking one-off heroes and villains you just really, really like