I vaguely remember you. Where you apart of the last magic the gathering roleplay I did? The idea of Elspeth and Jace hooking up has been presented to me before. For this roleplay I would allow it. I am going to adjust the setting to be more lore friendly. Meaning this will be post Avacyn Restored Innastrad. 

I am trying to imagine what such an offspring of Elspeth and Jace would be like. It is scary to imagine a being that can trace his magic talent to the keeper of the Guild pact and his martial prowess to the Sun God's own champion. Also, due to the nature or the sparks, a child of two planeswalked has the same chance of being a planeswalked as it's parents but crazier things have happened.