Gemini – Two-Faced Hypocrite - Normal
Force Gemini to use 4 Twin Universe cards on one of your creatures before defeating her; all of her non-immaterial creatures from her deck must be killed or otherwise removed.
Does mutating a creature count as "otherwise removed"? And does killing all creatures in her deck mean we have to have to leave her with 0 cards left?
First question: Yes, BUT that creature must also be removed from the field (if you can reverse time it into her deck and she can't play it, it's considered a 'dead' card).
You do not have to kill all of her creatures in her deck, but you DO need to make sure that her field only contains either:
a) Immaterial creatures
b) 4 copies of one of your creatures