I am waiting for Double Sea because I need it to complete a collection.
Also now Mozart because once I get Hell Twin from this island it will be the only one left to complete another collection.
I don't remember either dragon being offered in an event since I started playing May'17.

I want heroic dragon which I dont have.
I think I could get evanescent fae from breeding, whom I need very much. Recently got elusive whom I need badly, so all my requirements are coming down.

i have GOT to get that ever elusive Legacy to continue progress on the Asgard Cup ... do i "want" it, no ... must i "have" it ... yes ...

Oh yeah, heroics, I only have three left to get. Purity, tech and snow. All three from the old style of race, and after I started playing, but was newer then and couldn't afford the gems to advance enough to win.
I just got my last of the first heroic collection last week by trading orbs with my alliance, and using the heroic joker orbs.

@susan-mclaughlin Pyrotechnic with Far West running a close second.

@susan-mclaughlin Defoe drathic, only breedable legend I don't have and been trying for years and years and years.