I wish I could have recorded this because this is one of the most amazing things that has ever happened to me. I'm playing my second char through, and I am mapping through orr, and saving all my less than 80 exotics for the forge.
I just finished Malchor's Leap, which means I now have 4 exotic weapons and 4 exotic armors between 70-78. I put the 4 armors and get a Devona's Chestguard. That's pretty sweet. I put in the 4 weapons (I think there was a focus, an axe, a spear, and something else) and get............The Lover, precursor to The Dreamer. Quick TP check has it at 600g for highest seller. Not only do I get a precursor on my very first Mystic Forging of exotics ever (not including the armor one I just did), but it was from less than level 80's and mixed weapons. That's probably as lucky as you can possibly be.