Da Undatakah is able to gain the Test Subject deathrattle and when you cast a spell on Undatakah it will display in the tool tips that it is storing a spell, however (unlike a normal Test Subject), the tool tip will not display which specific spells are being stored and when Undatakah dies no spells are returned to the hand.
It is in the known issues list, hopefully it will be resolved with the next patch:
- Da Undatakah does not return spells if it gains the Deathrattle from Test Subject.
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