Its the 3 time per rewind that I'm worried about.
With a 10 turn stall thats 30 time quanta.
With 10 QPs you make over 3 time quanta per turn on average. I've played with an eternity stall like that I made earlier (the one with mark of light, sancs, and miracles) and was able to deck out even 60 card decks routinely. Keep in mind you have a long time to stockpile time quanta before you start playing eternity as well. There are no EQs in the immortal.
I would consider my version's lower use of time quanta to be a slight advantage in this case, but only slight. I think the immortal is worth planning for, but it's just one of many decks. There's a greater chance that they'll use one of the 2 decks with RTs or something new.