First of all, interesting concept. Mindgates + neurotoxin has strong potential.
In playing with it so far, I have found that in the most recent version with only 2 dune scorp / 2 unstoppable, one doesn't get the neurotoxin often enough to justify the deck space. 3 of each as in OP works at a much higher rate (combo math).
If the desired thrust of the deck however is a mindgate stall, it may make sense to replace the dune scorp and unstoppables with non-upped sundials (which can speed up / keep deck slow depending on need). Another possibility is to add a second eternity and an upped flying weapon.
In any case, I am having fun with this deck so far; thanks for posting.