Fractal did not and does not make this overpowered.
The problem was Sparks would survive.
It combined with dune scorpions is also not a problem. It still costs the same amount both in quanta and cards to inflict neurotoxin onto the opponent.
It is true that this card would allow mono dune scorpions or duo fractal scorpions. The question is "Is mono dune scorpions overpowered"
Forest Scorpions are considered balanced. Dune Scorpions + this card are identical to Forest Scorpions + 1 additon of neurotoxin.
The difference is cost to get out is 1 card and 3-4
.
Would a spell costing 4
that converted poison into neurotoxin be balanced? I think so.
However if it is the case that a mono dune scorpion is overpowered then why not change this card to something akin to the following?
Each
or
creature gets an extra turn every 3 turns.
That just reminded me of something.
and
are opposed elements. Why should they have a buff that affects both?