While these sets are incredibly impactful, they pale in the comparison to the most powerful set of all time , Modern Horizons 2
You can get Aggravated Assault on the battlefield very early, which can then start giving you extra combats
Since the deck focuses on gaining life, that won't be an issue, so you can freely include staples like Phyrexian Arena and Night's Whisper
What I can determine, though, is that the payoff for transforming this card is very good, and it is specifically this transformed effect which is more synergistic to blue builds
The system does therefore sound a little limiting if brewing decks is your passion, but there are already multiple unit cards for each playable champion, and presumably there'll eventually be several legends to pick from too
The cycle was later completed in Commander Legends so all 10 color pairs have access to one