I can only get the lessons that are in the first seven slots, because, at the time, players put 14-15 different lessons without any downside in their sideboard, so WotC limited it to 7 slots in best-of-one to reduce this strategys effectiveness
Renew seems too niche to see repeated use, but I could see it coming up once in a blue moon where it makes sense from the point of view of flavor
Control has gotten a new powerful commander in Aragorn, King of Gondor which I am sure will eventually see play.
The next Sliver leader was Sliver Overlord, a legendary Sliver leader that can search up Slivers from your library and steal other Slivers hanging around that you don't control
These help give any oops-all-Sagas Tom Bombadil deck an actual win condition, and they also mean that Tom Bombadil is the best commander for anyone who wants to play all of the FF summons in a single deck
7 Ajani, The Great Hearted Ajani, the Great Hearted is a perfect example of what's wrong with Selesnya planeswalkers