cdrcjsn
First Post
Mearls addressed this question in an interview at Critical-Hits
Yeah, I read that interview this afternoon.
So Shadow has to partly sacrifice themselves to gain power. A bit opposite of Primal, which is just bursting with life as a side effect of their connection to that power source.
Hmm...
Shadow - opposed by Feywild/Primal
Elemental - opposed by Divine/?
Bleh. Trying to build a Magic the Gathering mana pentagram is a failure.