It's an alternate art in relation to its first printing and not a showcase or anything, but the MID printing of Abrade is amazing. If we're limiting it strictly to variant printings, I think Embereth Shieldbreaker
They seriously nailed it with the storybook styles as the first iteration in Eldraine, and that was probably my favorite. The stark contrast and minimalistic colors are just really nice.
It also feels like they're loosening up on the "official" artwork and letting in more and more interesting stuff like that as time goes on, which is awesome.