Just had a game with the Hero Teron and the cards “Archlich Kel’Thuzad” and “Mummifier”.
I had “Rapid Reanimation” and Archlich’s Passive on Mummifier and my minons randomly kept Mummifiers Reborn Buff permanently.
Well that’s not a bug that’s exactly how it’s supposed to work
The main benefit of destroying minions during the recruit phase is to benefit from their deathrattle effects permanently
Your Kel’Thuzad destroys your mummifier, your mummifier gives reborn to another friendly undead Since this happened during your recruit phase, the reborn given to another minion is permanent
Unless I misunderstood what you are reporting
Is there somewhere that specifically states that? I lost to a build that utilized that mechanic and thought it was a bug too. If that’s working as intended then I love Undead builds even more.
Does it need to ?
If you buff a minion during the combat phase, then it’s temporary, unless it’s explicitely indicated that it’s permanent.
If you buff a minion during the recruit phase, then it’s permanent, unless it’s explicitely indicated that it’s temporary.
Those are the basics of how the game works.
Otherwise what would be the point of destroying an undead during the recruit phase with a tier 6 minion if its effect was temporary ?