For me, Accumulate Wisdom is, all by itself, a big enough reason to build around lessons, especially considering the new Avatar lessons are much more efficient than the old Strixhaven lessons, which seemed to get a one or two mana tax because of the learn mechanic letting you tutor them from your sideboard, but we've also got a couple of backup lesson payoffs too
Test of EnduranceTest of Endurance and the like are fun and I usually play an alternate win-condition in many decks, but this one I stuck away from this time
Each of the other seven can be linked to one of the Seven Deadly Sins through either their names and effects, or contextual cues around the way they took their permanent forms
As a single random card, fine
When a card is played, the player chooses if they wish to play it face-up or face-down, affecting the opponent's ability to see what the card is