Hearthpwn

I made a deck around, and think he could be quite good.

https://www.hearthpwn.com/decks/1245257-heal-druid

With the reveal of Potion Vendor as another option for reviving this guy I think his stock went up some, but I do agree that the proper list will need to be established.

Here is a crazy interaction with him that could make him difficult to deal with (If you are not a Priest with mass dispel).

So Have Lucentbark on the field, you play Undatakah, give him the deathrattle of Lucentbark, Deranged doctor and 1 other card.

Lucentbark goes dormant, Undatakah dies and Undatakah also goes dormant. Hero gets healed for 5 or more, Lucentbark and Undatakah comes back. Lucentbark and Undatakah becomes zombies as long as Undatakah dies while Lucentbark goes dormant and hero can be healed by 5 or more. Opponent must silence or win the game. 

Im not sure if Undatakah is random or if he goes by play order, and i wonder what would be the 3rd card in this chain for best effect.

Edit: I just found the perfect card for the chain: https://www.hearthpwn.com/cards/90663-recurring-villain

So if this works like i think it does.

Play Lucentbark, play Deranged Doctor and then play recurring villain. When you play Undatakah later in the game, Undatakah gains this  deathrattle: Go dormant. Restore 5 health to awaken this minion. Restore 8 health to your hero. If this minion has 4 or more attack, resummon it. 

So if played in this order, every time Undatakah dies, he comes back to life, heals your hero and brings an clone of himself with him. And if Lucentbark is dormant while he dies the first time, he brings an 4/8 Taunt with him.