The group chat got leaked and now you have been sentenced to death in a Roman wild beast hunt. If you kill the animal, another one will be put in to take its place. You are completely unarmed. Any animal that could eventually kill a human is allowed. (You can’t say something like a fruit fly, for instance.)
I actually had the same idea, and checked. Some mambas don’t cause the nasty flesh burning effect, but they still kill you by paralytic suffocation.
Too bad, an asp to the breast is a classic.