Light + Seaweed ... took many, many tries. Since the bring 'em back campaign began, I got a Victory dragon and bought a Kite dragon with saved up gems, and now with the Leaf dragon's arrival I only have one dragon left to go (the impossible Ovalith, which is Bloom + Panlong). I'm not counting the newly released Snowflake dragons in the total. It's good to have a purpose in life.