Well, its actually pretty easy, especially if you take a look at the handy explainer video here
I think the most important thing you can do with Hex Maniac is, say, you're playing against Jacob Van Wagner's Blastoise deck that he used to win Worlds this year
Again, these payoffs are mostly modest flashback spells or late-game engines which require additional mana investment like Ultimecia
Goblin Lackey comes down on turn one, theoretically, getting your Goblin Matron out on turn two to fetch you up another threat
The better build is tokens, of course, but people have posted these decks, if only for memes
Three star cards all feature 'immersive' art, which swoops into the frame and shows you the card from a whole new animated perspective