I don't believe there is a "location card" for a Waystone.
Wood Elf Cairn does not seem to have the right feel to be a Waystone.
Has anyone done such a thing, not necessarily the card simply "what are the effects of being near one?"
There are several types (using Realms of Sorcery basis):
Original Slann (Old One) set ones and then Elf-Dwarf cooperation-created ones from the golden age of their cooperation.
These together are the Great Network that feeds Ulthuan's Vortex.
Then there are the stones and henges built by humans who copied the style to mark burial sites and other important locations, sometimes still on ley lines.
For Great Network stones, I think minimally channelling magic is "far easier" (quoting RoS) so how about 2 Fortune Dice and One Success modifier.
I also think that, much as I love-love-love-marry-me-please miscasts, the "very purpose" of a Waystone in "grounding" magic would make them less likely (say count chaos stars as one less for miscast purposes only).
Particular sites could vary of course.
Of course, if you're an "old one" or otherwise using Rank 6 magic etc. you might once have been able to transport yourself along these but those paths are now dangerous etc. Teclis doesn't pop around this way so I don't think many other folks would be.
Any other thoughts?