It makes more sense to have mark of entropy and time towers. One time tower will fuel all your deja vu needs, and the supernovas will do in a pinch to fuel deja vus as well, whereas if you're depending on supernovas entirely for quanta, lack of entropy towers will stop you in your tracks. You only need 2 entropy to play a supernova, so a mark makes more sense.
I'm going to try building a minimally upgraded deja-vu deck in the trainer with adrenalines and unstoppables, because I won 19/20 AI3s with a very minimalist deck of 5 momentums, 5 adrenalines, and 5 deja vus. UPPED deja+unstoppable+epinephrine=24 unstoppable damage O.o Holy shit. I really have to try this now, lol. Reverse times are deadly, but I managed to punch through them, except in that one battle I lost where he drew a reverse time for every deja vu I played/adrenalined. I finally won by playing and splitting all the deja vus he rewinded ^_^ (think about it...)