Once again, while this change is labeled as an Alchemy rebalance, it seemingly will affect Historic the most
Key to the CityKey to the City makes Captain HowlerCaptain Howler into a Voltron threat, where he's normally just the huge creature that will get chump blocked while your tiny minions get around the edges for three and a card
Sure, those aren't playing Obscuring HazeObscuring Haze, but you can bet your bottom dollar that they're going to be throwing down with Fierce GuardianshipFierce Guardianship and Deflecting SwatDeflecting Swat, along with throwing in Force of NegationForce of Negation and EnduranceEndurance
If so, token decks may be right for you
Ling Imperial Soldier gives each of your Heroes an extra point of Strength
I know plenty of people that would go wild for something like this