Well... I see no reason why shouldn't be able to card the Elnoyle in esthar. Also... I'm not sure, but... don't you get Energy Crystals when you steal from Elnoyle's?

Dragon Fangs are trickier as I don't think there are any cards that can be refined into those. I guess you should try stealing from Blue Dragons, though. But I don't remember whenever you get Dragon Fangs or just Fury Fragments.

Oh and are you SURE that you will need Lionheart? I mean... why shouldn't it be possible without it?