Being an older card, there aren't many copies of Petrified Field still in circulation. Back in October 2015, I picked this card as a long-term investment, especially the extremely rare foils. It was only $4 a copy at the time. My target price was $8-10. As of March 2, 2016, the price jumped from $5 and hit $12. I expected foil copies to hit $20, and they are now over an average of $35. This wasn’t really a buyout. It was more of a price correction for a fairly under-appreciated card.
This is definitely a card that could be reprinted at some point, as it's not on the Reserved List. So keep that in mind when deciding what to do with any copies you may already have in your possession. Now that the price has settled around $10, however, you’re safe to pick any copies that you’d like.