In the first line of the second stanza, "...touch such toxic again" it feels like you need another word like "Touch something so toxic" or "touch such a toxic" unless you did it for creative effect, which I'm all for, but purely from a grammar perspective, it is missing something.

And in the third line of the last stanza, casted can simply be cast.

In fact, you had a great balance of personal and general, which made for a very well done piece. Heartbreakingly beautiful.

I would have been blown away if the last line to this would have been

"why, why did I become Toxic"

thoroughly enjoyed it, terrific write.....

Congratulations on your win.
Take care Cindy