It has a much lower impact than Cathartic Reunion or Faithless Looting, but it is a necessary piece in getting your engine rolling in the first place
Even in the late-game, it's useful as then you can get the more impactful Lessons that cost more mana so you can cast them as soon as you add them
Magic: the Gathering New & Returning Mechanics in Edge of Eternities Warp You can cast this card from your hand for its Warp cost, then the creature must be exiled at the beginning of your next end step
Creatures are just the permanent type which has the most opportunity to impact the game over time, and thus the most valuable upgrade you could add to most sorceries is a 2/2 body
On the other end of our rankings, we have Saskia the Unyielding, who is is pretty much just a creature that attacks and blocks
Of course, if the other creature is a Reflector Mage, youre kind of doing it anyway