Hee. Yeah, Greenweaver Druid plausibly could be this cheap if you can only cast vanillas with it. You can't even cast token-making spells, which were the best thing to pair with Muraganda Petroglyphs.

Mashup of Elderwood Scion and Meysa Tutor.

I went through lots of ideas like "when this card becomes the target of a spell or ability, search your library..." but ended up combining "no abilities" with " less" to get something that could go in Murganda.

I'm not sure if this needs to cost 1G (even if the P/T increase slightly) or not. There's not that many cards it works with: it's amazing if you can drop Advent of the Wurm or Imperiosaur on turn 2, but they're not vanilla (I think), the best is probably Leatherback Baloth.

ETA: It would be nice if it worked with token vanillas, but I don't think there's any way of saying that.

Indeed, Advent of the Wurm and Scatter the Seeds definitely don't count, and nor do Imperiosaur or King Cheetah, nor even Barkhide Mauler. This can be spent to cast Fusion Elemental and Woolly Thoctar, but not very productively.

Here's a list of all part-green things it can cast; vanilla artifact creatures and off-colour vanillas also work.

I suggest you probably do need to give this a slight P/T increase at the moment though :->