Shouldn't it be in the Humor board?
^
I agree. Its a little too much I think.
The mechanic itself is interesting. I've seen something similar once or twice before, although I've never seen the "remove" purify part added in on top of the poison.
Assuming the comical nature doesn't necessitate a board move here, I think there is some potential for a viable card.
The effect is rather under powered right now. It will a good deal of boosting.
It neither heals effectively enough to be worth the price (compare with holy light and heal), nor does it provide enough poison to be worth the cost either (compare to poison and deadly poison, aflatoxin, parasite, etc.)
I think you could safely bump both the healing and the poison output at least 2 fold (if not more) and it would be relatively balanced.