I'm going to try my hand at telling the Wickard case in a soundbite form.
The court found that Farmer Filburn had a complete right to plant excess. He could feed it to his livestock without penalty. In order to avoid the penalty under the law, Farmer Filburn would only have to feed the harvest to his livestock before threshing it, that is, before removing the grain from the chaff.
"Feeding before threshing" has exactly the same impact on interstate commerce as "feeding after threshing."
I haven't figured out a good soundbite to describe the legal nonsense that follows, to this day, a decision that let Farmer Filburn affect interstate commerce with no interference from the government, as long as he didn't thresh the excess of his harvest.
And we’ve all been getting thrashed by WvF ever since!