5 group cards 1st grade Preschool to math kit for number recognition and addition and ten cards Kayla B's Classroom

They have seen success in builds involving Orcust, Burning Abyss, as well as a stand-alone deck with powerful recent support cards

Shrouded Fable packs can come with reverse holo Basic Energy

Of the cards listed here, Tower of Coireall is probably the best

BPhillipYork: This set seems concerned with modified creatures, which makes sense, given all the Spider-Mans and Womans and Villains are essentially modified via lightning or a spider bite or radiation or something

But the repeatable, colorless, Carnage Altar has been the class at for many reasons

Like the previous museum secret missions, this may take you quite a while since they're rare cards to find