I've picked c for stats because it was the only one offering 1 MP. The Basilisk should be a natural threat, but it's basically an animal, which relies off instinct instead of thought.
I also picked J for it's ability because it's closest to the one I want to suggest.
I've read through the suggestions and some of them are indeed pretty good. I think it should have two special abilities, though, if you don't mind my late suggestions:
On the Basilisk's turn it may make a regular attack with 2 or 3 combat dice, if any skulls are rolled the hero takes poison damage as well (which may be reduced with an anti-poison quill, or anti-venom potion)
Or
The Basilisk may use Stone Gaze on any hero directly in front of him with 1 combat dice (needs a skull), the hero may roll as many combat dice equal to his mind points (requires white sheild). If the hero fails to defend he is permanently turned to stone.
Basilisk should only have 1 MP, the Stone Gaze shouldn't count as magic, as it is a unique ability the Basilisk naturally does.