How to get a pet Hydra?

Excuse me, I couldn't help but notice your mention of a pet Hydra. Could you elaborate on the process of acquiring such an exotic creature? Is it legal to own a Hydra in most jurisdictions? What kind of care and attention does a Hydra require? Are there any specific challenges or risks associated with owning a Hydra as a pet? Additionally, where would one even begin their search for a Hydra to adopt as a pet?