Useful list if, like me, you have a lot of dust post-TGT. I crafted Ysera, although my ramp Druid is still losing a ton.
Legendaries used in a variety of decks or are staple for competitive play. (The ones to craft)
Source: Legendary Tier Crafting Guide – Card Discussion – Hearthstone General – HearthPwn Forums – HearthPwn