Dracthyr already have a connection to the Emerald Dream in the abilities: Call of Ysera (This alone should be enough), Dream Breath, Spiritbloom, Emerald Communion, Dreamwalker, Fluttering Seedlings, Field of Dreams, Life-Givers Flame, Ouroboros, Renewing Breath, Dreamflight, Cycle of Life, Lifebind, Lifeforce Mender, Lifespark, Verdant Embrace, Sleep Walk, Bountiful Bloom, Panacea, Lush Growth.
“Most references to the Emerald Dream in the original version of the game occur in Moonglade, which is the haven for the druids on Azeroth. The references occur in quests that involve Keeper Remulos, a Keeper of the grove and the ruler of Moonglade. Likewise, much of the Nightmare’s influence upon the Emerald Dream involves the green dragonflight, the protectors of the Emerald Dream under the jurisdiction of Ysera”