Each deck comes with the following: 100 total cards, each with 25 new-to-Magic cards
For example, if three non-Human creatures attack, you won't look at the top eighteen cards of your library at once
Selch is also comparable to Kiora, the Rising Tide, a staple of Abhorrent Oculus lists in Standard, and given that Kiora has a hard time fitting into every Oculus list, it's hard to imagine a card that requires twice as many cards in the graveyard appearing in an archetype that sometimes needs to exile five to cast its main threat
In The First Chapter, Enchanted Rare cards could be found in roughly 1 in every 72 booster packs
The cards would play similar roles, and Enduring Curiosity not only has built-in protection but also requires significantly less work to use