Dang, this is the one colored Lesson so far that I can see people running in the main deck. And I can fetch it out the sideboard if I need to? Yes please, I'll take four.
I still think Academic Probation is the best all-rounder Lesson in the sense it's never a bad card and I always would keep 1 in my board if I run Learn cards, but this has such a huge potential payoff for no opportunity cost... I think I like this one more tbh.
Playing since 1994: Currently Pioneer, Pauper and Modern
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The bigger question: Do we play this or apparition?
Do you expect to go into mid/lategame? If no Skyclave Apparition is better in every way - comes with a body, forces your opponent to use resources to get the token back, can be blinked and its only real drawback is that maybe sometimes the creature you give your opponent will be bigger.
Otherwise, this seems like a good deal. Having a fixed body makes it easier to plan accordingly - for example by running first strikers or just lots of Shocks - while it's also much more useful in lategame. The real advantage is of course it being a Lesson - you could run Professor of Symbology for a decent two-drop that fetches it when you need it, or maybe just grab Academic Probation if you have nothing better to do and need some protection from a, say, Emergent Ultimatum or a Doomskar for a turn. Hell, you can even blink the Professor if you need more cards. It's far more flexible and ultimately generates more CA but the downside for that is of course that it's slower than just playing Skyclave Apparition. Which comes once again to my first question: do you expect to go into lategame? Because if so this is a very valid option.