Platform, device version and operating system:
PC, Steam client, Game: 4.2.0.07, OS: Win 7x64 SP1
Screenshot or image:
What you were expecting to happen, and what actually happened:
Any Doom card is invulnerable when fully traited.
It cannot be killed instantly by lethal attacks or magic spells that sacrifice it.
I am not sure about Zuul’Goth, though.
Sacrifice and Widow Queen can’t kill your Doom troop, but create the gems or do the damage - not a bug.
Princess Elspeth and Sacrificial Priest can kill your Doom troop - a bug.
The Zuul’Goth, not tested.
How often does this happen? When did it begin happening?
Always. Not sure, probably since the 4.2 update.
Steps to make it happen again:
Refer to my Example case to replicate this issue.