It is a Mutant Cacti! A genetic defect makes this monstrose cactus truly unique. The naturally occurring mutation or "cresting" causes wildly curved and twisted plants.
Care:
Prefers 6+ hours of bright, indirect light in a West or South facing window. Water when soil is dry or plant starts to be less "plump". Plant in a fast draining cactus or succulent mix.
Available in a 4.5" container