Let's start with the Headmaster himself. He is definitely inspired by the Harry Potter universe, but not by Dumbledore. He looks more like Durmstrang leader and former Death Eater Igor Karkaroff!
Looks like Dumbledore is not the only one who's stacking illusions into bottles!
Hogwarts has its Fluffy and Hearthstone has the Guardian Animals. They look pretty similar!
This caged Gibberling looks exactly like something professors Hagrid or Lupin will sneak inside the school to show the students.
A terrified student flying a broom with an epic castle on the background? Looks like a direct flying/Quidditch inspiration!
Hogwarts has its ghost society and so does Scholomance Academy!
This Draconic Studies tome looks exactly like Harry's Monster Book of Monsters!
Ever wondered how a Patronus charm will look in the world of Warcraft? This card is giving us a glimpse.
Wandmaking is important! This Olivander/Gregorovitch-inspired art is full of Harry Potter vibes - even has an owl!
Looks like one of the Weasley brothers made it all the way to Scholomance!
Messy hair, tons of books... round glasses? Looks like Harry and Hermione got gnomified into one!
A Gnome casting a charm to lift a feather? "It's levi-oh-sa, not levi-ohsaah!"
Oh, come on, Blizzard isn't even trying here - this is literally a Gnome Bellatrix Lestrange!
Scholomance Academy is Hearthstone's school of magic for kids and parallels with J.K. Rowling's Wizarding World are inevitable, but have you seen all the little things that Blizzard has been hiding inside the cards?