This is just the result of various collections of information, you don't have to do it to get a competitive deck. Read the descriptions of the cards before creating them, to see if they can match the decks you want to have.
With the power of the Galakrond Warrior, it's not surprising that there are three cards playing on the Invoke mechanic in this list. Despite its nerf, the Scion of Ruin remains a very powerful card to regain control of the board.
Deathwing, Mad Aspect and E.V.I.L Quartermaster are also present in some lists but seem much less obligatory.
As the Pirate Warrior deck has lost some of its superb with the nerf of Ancharrr, the cards that make it up are much more dispensable. If this archetype interests you, don't hesitate to craft the weapon, but also the Sky Raider and the Skybarge.
The new Hearthstone extension, Descent of Dragons, is available since December 10. Here is our selection of decks made by professional players or streamers, to have fun once your boosters are open.