Masteria Monster Cards Project

The real one is on the left. If you look really closely, there's a light blue outline.

That's only on the WT cards, not on cards from KMS. That's one of the reasons why the WT cards look so inferior by comparison.

I've only seen the Phantom Trees that are facing toward the left:

I haven't seen the Phantom Trees facing toward the right:

I asked IsaacGS about it, and he said that the ones facing toward the right are just part of the background, or something like that (sorry, I have a bad memory.)
I think you should make cards for the first two, if you want.

They are real monsters, they're just not apparently in game anywhere.