[2019] If you aren't planning on adding more reborn minions, why even give paladin the reborn quest

What makes the current reborn quest powerful isn’t really the reborn minions themselves, but what you can do with the hero power. There are enough reborn minions from Uldum alone that allow Paladin to fairly easily complete the quest. Right now, they are using cards like Mechano-Egg and Mechanical Whelp as the payoff cards once the quest is complete. It’s likely we’ll make other cards that are great with the quest payoff over time, making the quest feel a bit different with each set.

Wow I didn’t see that. I was just reading the forums as I usually do and thought the thread was a good place for insight, even if we disagree.

It’s a fair assumption to think all expansion keywords are that expansion only unless stated otherwise. Sometimes we have a mechanic that makes sense to keep around in Hearthstone long-term (Rush, Discover) but we let most keywords live in one set only so they rotate to Wild cleanly and make way for new keywords to learn.