Wow. Checked my math and it turns out I was wrong too.
I must've missed something in my addition last time. I did it again and got seventy-seven, not sixty-two. Someone should probably check the numbers in the full breakdown below.
Start with 23 golden nymphs and 16 golden hourglasses on the field and 8 aether towers in hand. Assume enough quanta for every card played (except aether).
Play 8 aether towers. (more than 8 quanta already in pool at this point though)
Use nymphs to draw 1 fractal, 1 pandemonium (unupped), and 1 brimstone eater (BE means this, not butterfly effect).
Use panda to rewind 3 used nymphs, play 1 BE and fractal it.
Play 2 more BE's.
Use nymphs to draw 9 aether towers (played as drawn) and 1 fractal and 1 panda.
Use panda to rewind 11 more used nymphs as well as the 3 BE's on board.
Play remaining 6 BE's from hand and fractal one.
Play 7 BE's (keep one in hand).
Use nymphs to draw 5 aether towers (played as drawn), 2 supernovas (played as drawn), 1 fractal, and 1 panda.
Use panda to rewind the remaining 9 nymphs and the 13 BE's.
Play the last 1 BE in hand and fractal it.
Play all 8 BE's.
Use hourglasses to draw 4 supernovas, 1 aether tower, and 1 fractal.
Fractal a BE.
Play all 8 BE's.
Use hourglasses to draw 9 aether towers and 1 fractal.
Fractal a BE.
Play 6 BE's (field is full at this point, so two left over).
That's a total of...
39 brimstone eaters
32 aether towers
6 supernovas
For 77 quanta sources in one turn.