The short answer, really to my amazement, was that they broke expectation in a pretty significant way
Thus, it contains primarily humans and deals as the name already implies with the new Coven mechanic
Despite having lots of powerful EtB effects you are paying a lot of tempo to do so
The key to beating that deck is managing their creatures, and when you Aether Gust something after they commit prowess triggers to it, the end effect is basically the same as a hard removal spell
Harness the strong aura of Mega Lucario ex, embrace the overflowing power of Mega Gardevoir ex, and team up with more of these powerful Pokemon that boast devastating attacks and massive HP
(Devotion to two colors doesn't show up in this set, but it has appeared on previous cards