So Toxin was made with the original Cobra scheme and the Japanese exclusive Nightrider.
Im a little biased and think that my reverse testshot Cobra and prototype Cobra are the best versions of this mold. Second place goes to the Cobra Commander head.
Anyway here is Toxin.
My Nightrider had yellow plastic for the tank treads and tail. I dyed it to match the gold plastic of Black Zarak better.
Stronghold and Toxin!!!
Here is a chronological order of all the Cobra Headrobots.
Here are all the card backings. Including the overseas exclusives and early release variants.