Maybe Mitosis a Firefly then. The 3
for a 4|2 creature is better than 7
for a 3|7 creature, even if the child can't continue spawning stuff. Also speeds up the rush, since you're more likely to have 3
on the end of a turn than 7
.
Second turn play FFQ, third turn spawn a Firefly and Mitosis it. Fourth turn spawn two more Fireflies.