Hi, when i played death blossom whomper and gained a deathrattle, it died and the deathrattle worked, after i played da undatakah , the card not gained the deathrattle of deathblossom whomper. I dont know its a bug or its not working for this card, thanks for the answer (sorry for bad english i hope you understand 
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Death Blossom Whomper doesn’t have a Deathrattle. It gains one with it’s Battlecry, yes, but the minion itself doesn’t have a Deathrattle. It is the same with Da Undatakah, he himself doesn’t have a Deathrattle as well, but gains one.
So, basically, Death Blossom Whomper isn’t in the pool when Da Undatakah picks a Deathrattle, because it’s not a Deathrattle minion.
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