Here's another mystery signature. I have four copies of this Wall of Roots (from Mirage) with a signature (initials, really) that looks like "LB":
But the artist on this card is John Matson, whose initials are clearly not "LB". And it just so happens that I have another card from Mirage, Purraj of Urborg, with art by John Matson that is signed by him:
So I think it is quite clear that the Wall of Roots signature is not Mr. Matson's. So, whose signature is it? Any ideas?