Underbelly Ooze + Divine Spirit + Embalming, season with Inner Fire if desired.
Underbelly Ooze is a "Summon a copy" effect, so each copy should get both the enhanced health and the Reborn tag. Ergo, you'll get a board full of 3/X Oozes with at least one 3/1 token hiding inside of them that can be healed for more cringe-inducing minion value.
Quite possibly the (Metaphorically and literally) stickiest board in Hearthstone you can make, assuming you've played deep into the game and your opponent has burnt all of their Silences on your Cairnes, Zereks (Note: Zerek should clone itself, leave a 5/1, and potentially create another 5/5 from the Reborn's second death if it carries the "spell casted" attribute, which it should as this spell adds the Reborn keyword to its copy and thus alters the card; this works similarly with Cairne), and Splitting Festerroots (Hey listen, that's a lotta stats for 9 Mana. Listen. Look, it'd be cool).
Now, would you build a deck around that combo? No, but it uses Priest staples and would slot easily into a minion-heavy Priest deck, so let me say: a vicious meme in the making.
It's different because it costs less and is in a different, notably Deathrattle-oriented, class now. Priest also has massive synergy with low cost spells.
Bear in mind, the entire Reborn keyword is just Desperate Stand's effect, so that criticism applies to the entire expansion. That aside, I think Reborn is an interesting concept and fits with the Mummy theme nice.