Gush has just one FOIL printing, from Mercadian Masques. All 3 printings (the other two are older duel decks) are trending pretty hard in non-Foil. I think we'll see a second half of this ongoing spike in Non-Foils in a few months, bringing them to a solid $3.
The Foils have been hovering close to $20 forever. A few weeks ago, the Foil price started showing some bobbing and tightening, and once they spike (which could still be a month away), they'll be headed to $50+. I would not be all that surpised to see these at $100 apiece in several years.
Vintage staples don't mess around.
and (below) the same with the Foil line added... if you look closely, you can see it starting to wake from it's long, long slumber...