Can anyone explain to me why Foil Nyx-Fleece Ram is legit $20 right now? I have one and the art is super cool foil, is that the only reason it's so much?
It's 20 times the value of a non- foil one.

If it is run in a deck somewhere, besides standard, does anyone have a link or can tell me about it. I am really curious about that card.

It's playable, and bigger than most burn spells can remove. $20 may be high long-term, but they are harder to find and it's seeing play in most white-inclusive decks at my LGS. I'm also starting to see them in some Commander decks, just because the card makes a great early blocker without having defender.

its likely partly also a limited number of people selling. All the middle ground values around $5 have been bought out. Leaving only outliers in the $20 range.