Okay listen. I UNDERSTAND THAT THIS INTERACTION DOES NOT WORK. WHAT I AM ASKING IS WHAT WOULD HAVE TO BE CHANGED TO MAKE IT WORK.
Here is another card that has existed in HS:
This is simply a targeted Undatakah effect EXCEPT that it says "gain a COPY of" instead of just "gain." It is still a battlecry, and it also does not transform the Raptor into another minion. What I am saying is that there is a non-keyworded and unexplained difference between "gain" and "gain a copy of" in these two cases, and with respect to deathrattle effects. It seems to me like a distinction without a difference.
Dude, I just explained to you why "gain" doesn't work and gave you 3 different wording cases that do work. Was it too long for you to read or what?
Also if you don't believe us about the raptor, it's not hard to go test it out yourself LUL