The announcement video went up through their Youtube early giving us the first glimpse at the set which is basically sounding like a return to the first Hearthstone expansion "Goblins vs Gnomes" with an emphasis on new Mech cards and some crazy new ideas.
Edit: Official Announcement video:
Cards:
The card reveals begin officially on July 23rd but a couple cards were shown to tease some of the ideas and mechanics of the set. Magnetic is the keyword which requires you to have another Mech on the field but allows the card to be played as a spell on to Mechs. They have also introduced Legendary spells into the mix (outside of Quest cards).
For Magnetic in this case, if you have another Mech in play, you can give that Mech +2/+2 and Deathrattle instead of playing Spider Bomb as a creature.
The standard 50-pack preorder will return along side a new 80-pack preorder which will include a Golden Legendary and Mecha-Jaraxus as an alternate Hero portrait for Warlock.
Maximize 17 damage to the face if old.
Sources:
https://dotesports.com/the-op/hearthstone/news/boomsday-project-next-expansion-30821
https://dotesports.com/the-op/hearthstone/news/boomsday-project-first-cards-30823
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