-1 Fractal
+1 Light Nymph
Well, the lucky people who have useful nymphs...should use them. I consider them non-existing cards because you can't get one even if you want to.
The variant I tried does take 0.37 turns longer on average to use fractal and hope, but is almost a turn faster on average to play electrocutor and is slightly faster when it comes to simulations taking into account how long it takes to play all three: electrocutor, fractal, and hope.
Nice simulation. However, unlike hopes or electrocutors, you do need to play multiple fractals in a match, and sometimes 2-3 of those early. If you are facing some creatures in the 8-15 attack range, like dragons or buffed creatures, you need the second fractal as soon as possible to stay alive. (one fractal usually produces 5-7 rays at most) Having only four reduces that chance too much I think. Against creature removal like eagle eye (or a stolen lobotomizer), you might even need as much as 3-4 fractals just for your rays.
You'll also need a fractal for the dragons, so an average game needs about 3 fractals drawn. The chance of drawing a fractal decreases significantly as the number of them decreases in the deck, and the time to draw them is often limited : Elidnis and Rainbow can grow creatures by 20 attack each in just 10 turns. Drawing that third (or fourth or fifth) fractal you need two-three turns later might be a critical problem.
Having a somewhat clogged hand also increases the number of fractals you need to play, and 4 hopes+4 electrocutors+4fractals+2dragons can clog up the hand almost the same as 4+3+6+2 can, but the chance of not having at least 2-3 fractals out of those to make up for the lost space in hand is much much greater. (Miracle adds to this clogging effect even more, by the way)
In addition, playing each of your fractals 0.37 turns later, if you play 3 every match, makes every match at least 1 turn longer on average. If your matches are on average 20 turns long, 1 more turn for each is an ~5% loss in efficiency. (Although it won't but just 0.37 turns later for the third and later fractals)
In addition to all that, in case of healing gods, building up enough quanta to fractal AND play enough dragons is also critical. For that, two fractals on rays as early as possible is necessary, one fractal doesn't generate enough light quanta, and you might not be able to play enough dragons in time.
I think it's more reasonable to assume that you need to play 1xhope 1xray and 2xfractal early in at least half the games.