Storm Crow being a powerful card became a meme...then a card itself.
Wizards of the Coast loves to bring in call backs in Magic: The Gathering card form.
Just look at any of the holiday cards.
But sometimes they bring them back in unusual and more creative ways. For example, when Unstable came out in 2017, the game introduced a new card that calls back to a meme-worthy card that first came into being in 1996's Alliances.
Storm Crow, really, isn't exactly a powerhouse card (even by 1996 standards). For two mana (1U), it's just a 1/2 flyer.
But, as it got more and more reprints, it got more and more of a reputation as a sarcastically powerhouse card.
Over the years, the joke grew, and Storm Crow was routinely among the top cards in favorite or most powerful votes. The fact that some players even began using it and proving that they could win by utilizing many and paying for Force of Will easily actually led credence to the whole thing.
WotC, of course, took notice and kept printing it again and gain, even having new art commissioned for it. Then, when Unstable came out, they decided to actually, purposefully make it good with Crow Storm.