There are two main categories: Black Star Promos This is an official promo series with card numbers that runs through an entire generation
And, perhaps most importantly, always aim to build something you'll actually enjoy playing
Jump Scare's versatility makes it an excellent example for card interactions explained in many other release notes entries
If you read this article and thought, "I want to try playing DMEDH!", please try building your own DMEDH deck
Either way, pack a Grand Abolisher to prevent interaction when you want to go off, and consider the plentiful tutors in GW that can help you access your toolbox and your win conditions
While not as fierce, Milotic has a similar appeal as Gyarados in the whole uggly-duckling-turned-attractive-Pokemon way