No.. think about that! Venon enough, by itself, is powerful enough to take down humans. Also, think about what Venom is, it's, basicly, pre-digestive fluid. Spider, scorpion, snake nicks you with that and you're being immediaty eaten from within.
MAGMA VENOM. It...seems like it'd be a neurotoxin mostly...but maybe a hemotoxin as well. But, I think it'd just eat EVERYTHING, your blood, your nerves, and your bones.