Board Thread:General Discussion/@comment-5968091-20130516054130/@comment-182.185.133.29-20130517085457

151.230.23.126 wrote: It IS real. On Twitter when someone asked about card jitsu shadow, Spike Hike said: Snow first. This is proof shadow will probably come in 2014!

And even in a video Happy77 is dressed up as a Shadow Ninja. This probably proves the the element of Shadow is real.