Mwonvuli Acid-Moss? The hell?
Yeah, I had never seen this card before in my life. But it's really good (efficiency and hidden power in a common slot) and it seems to have slipped under nearly everyone's radar.
It's a stone rain with a forest fetch for just one more mana. Extremely efficient, and green has been locked out of land destruction in favor of red (and black) for years.
Non-Foils are spiking from PURE BULK (<$0.25) or so up to over $1.00 apiece. If you can find a big chunk of these for around $0.25 apiece or even $0.50 apiece, I'd say go for it. I don't see these keeping much more than $2 apiece long-term, and a reprint is a sure thing (pretty flavored, though, so expect it in a Commander or Duel Deck).
Foils are where it's at, though. There are a handful around online for about $5 each. We're looking at an easy $15 in a few weeks.