Canopy would see a ton of play if it was fetch-able. I'd like to think that it should be considered a staple for Dredge. Its getting a very badly needed reprint, and I think you should see an uptick in how often the card is played with that.
Back when Massacre was more of a staple I played Plains-less W/g hate. They've printed enough faux savannahs that you can reliably play those colors without it (Razorverge, Canopy, Brush, Cavern).