Make sure the opacity command is before the scale command.
Remove “in zone 2” from the scale command, the zone only needs to be added to the shift command.
If you want your overlay to grow to the scale size of 0.34, it needs to have a starting size smaller than that size. Otherwise if you just have it scaling to 0.34, then it shrinks from it’s default size of 1.0 down to 0.34.
@overlay DARK MAGIC create
@overlay DARK MAGIC to layer -2
@overlay DARK MAGIC shifts to 146 87 in zone 2
@overlay DARK MAGIC opacity 1
@overlay DARK MAGIC scales to 0.1 0.1 in 0
@overlay DARK MAGIC scales to 0.340 0.340 in 3