-Make the drop rate maybe 1 in a million or something outrageous like that
-have 6 random properties that you get to choose from the entire affix pool that all roll at max values
-Require a crazy amount of crafting mats to forge the armor maybe like 100 of each mat in the game and a certain legendary of the same armor type
-After you craft the armor the blacksmith forgets the plan and can never be taught it again
I think this would be a really cool way to spice up diablo a little bit in terms of gear. You can have something really rewarding to work towards and also have an extremely OP piece of gear that is completely unique to you and how you want to play.
Let me know what you guys think