Avengers Spotlight #37, "Interlude in a Peaceable Kingdom!" Written by Roy and Dann Thomas, art by Bob Hall, inks by Win Mortimer. Before I should go on, I should point out all the above creators have done work I've liked far, far more than this issue! But, they only have so much to work with here, "The Reincarnation of Doctor Druid!"
This was the first of four issues of Avengers Spotlight--which was mostly terrible every issue I ever saw of it--under the heading "Avengers Reborn." The next three were Tigra, the Black Knight, and the Vision, and I haven't read them and thus shouldn't badmouth them sight unseen. But this issue starts with Dr. Druid, amnesiac and lost in an Eden-like paradise, with a blonde in a torn-up costume and telling pinstriped thigh-high boots. Suffering from nightmares and feeling he has to find the truth, Druid uses his mental powers to dig through his thoughts and drudge through his origin and history: years ago, in the Himalayas, Druid tried to save the life of an aged lama, who on his deathbed bequeathed Druid powers to fight "sinister occult forces." Which he did for some time, until he eventually joined the Avengers; but fell under the control of the mysterious Nebula. Nebula had at various times claimed to be the granddaughter of Thanos, and worn the uniform of Kang the Conqueror, and appeared as an alien with blue skin, or a blonde beauty that somehow was still interested in Druid. Regaining his memory, Nebula likewise regains hers, and they realize their "Eden" was merely a shared hallucination, and they're still in the time bubble of the Renegade Celestial they fell into when last seen.
Nebula absorbs "anti-time" power, and returns herself and Druid to earth, in 1961. And Lincoln, Nebraska. There, Nebula figures there will be no super-heroes to stop her, and casts Druid out. Inexplicably, Druid lands in Tibet, outside the lamasery where he first got his powers. Druid runs through his origin again, but this time, the "lama" reveals the truth: Druid was a test case. The "lama" was actually the Ancient One, who needed to test his ability to pass on his powers, and create an interim mystic champion until Doctor Strange was ready. Druid isn't even mad about this, because "it's not everybody who gets to be point man for a Sorcerer Supreme!" (This is all pretty meta, since Druid was formerly "Dr. Droom" and was pretty much the beta version of Dr. Strange.) Druid feels his missteps, like his Avengers tenure, were the results of him feeling like a second-rater; but he did succeed at his previously unmentioned and unknown to him mission, so now he thinks he can step up to Nebula.
Dr. Druid would turn up another couple of times, like in Mark Gruenwald's Captain America a few times (most notably during "Cap-Wolf!") but his revamp didn't take. But if you've read this issue, you're probably more than OK with Warren Ellis's treatment of Druid...