Arkham Horror LCG is designed for solo play: it is played with one or two investigators controlled by a single player, the rules are identical
On the other hand, the long-winded introduction and rare subsequent usage allowed them to retain their godlike status and the thrill of their appearance in battle, even before we talk about their crucial plot relevance for the remainder of the series
For that reason, I think its particularly worth it for Rakdos Goblin decks, which can easily run the above combo, while still being able to effectively use First Day of Class when its used in a more straightforward manner
Wilds of Eldraine is going to have its own bonus sheet of reprints included in the set with Enchanting Tales, a series of enchantment cards that are themed around traditional fairy tales, which is appropriate for the fairy tale plane
return 1 Fusion Monster from your GY to the Extra Deck, then Fusion Summon that Fusion Monster from your Extra Deck, by banishing Fusion Materials listed on it from your GY