Mulligans
This deck is meant to some how use the Dr. Morrigan legendary with the Undatakah card. The goal of the deck is to let some deathrattle cards die, but you must have Dr. Morrigan die, that way when Undatakah is played, he will gain her deathrattle(Swap this with a minion in your deck). This will cause Undatakah to be shuffled back into your deck. You also have Cairne and Voidlord who are great deathrattles for Undatakah.