And that's beside being a fun build-around mechanic with lots of design space
While Lessons themselves don't look powerful enough to warp the format, even if they do come as a freebie, I also remember how obnoxious it was to deal with adventure-based decks that would just endlessly spawn perfect answers through the use of Fae of Wishes
Atraxa, Praetors Voice The Queen of Counters, Atraxa was one of the first box Commanders back in the day, and she still sits at the top of the charts
Rhys got a sweet double whammy in Rhys the Exiled and Rhys the Redeemed, Maralen got Maralen of the Mornsong, there was the Vendilion Clique, and of course Oona, Queen of the Fae
That means you can spend your mana to cast anything from your foe's hand
Meet our party of intrepid adventurers (and Themberchaud) here: These cards, like previous releases with the SLX set code, are mechanically identical to the cards featured in the Secret Lair drop