Jaya's Immolating Inferno cost not being reduced by other cards. [Investigating]

I had both Raff Capashen and Jhoira's Familiar on the board which are supposed to reduce the cost of Historic cards. JII is a legendary spell and the cost was not reduced by either card. 

Also when I cast it with Jhoira' Weatherlight Captain on the board it did not cause her to trigger her ability. I believe that while it has the Legendary symbol it is not being counted as a Legendary card.

//Edited Title -Brigby