Good point, Riccardo
All of the info packed onto that petite piece of cardboard can be a little overwhelming at first, especially for some of the more complicated cards out there, but a little explanation about the important parts should ease your entry into the game
With all new cards, mechanics, powers and abilities, the cards from the Hour Of Devastation set can help you buff your existing Magic deck or create a new one from scratch
However, there are just 4 unique new Fabled cards, with 2 copies of Aurora Holding Court for 5 total
You want to be good at navigating your opponent's removal and making use of your graveyard, so I consider this middle-of-the-road in terms of EDH power level
First introduced in Wilds of Eldraine, the Adventure mechanic allows players to cast the Adventure half of a card, then later cast the other half from exile once the Adventure resolves