MTG Double-facedcards: Sephiroth+ Tamiyo

I bought an order of 4 cards,

At least 1 of the 4 was fake (Sheoldred) with a fake green dot and non-existing T-test. Another 1 is real (Darkness Crystal). Before I make the appeal for fakes I'd like to check the authenticity of the other 2 too.

After browsing through the sub, I still have a hard time validating these double-faced cards. They failed the weight test by 0,1g + a light test (close to no light going through). So I'd like to get some other opinions.