This seems to be on the slightly OP side.
Comparing Deformed Witch with Fallen Elf, you get doubled stats and a mono costing skill instead of a duo for only an additional two
.
Abstracted Witch costs the same as Fallen Druid, but has again double stats and an ability that is the same other than the fact you don't need other quanta to use.
tl;dr, make both cost 6
and give it a stat reduction. Otherwise, nice job. :D