A beautiful and unusually-shaped tropical cactus often confused with Epiphyllum anguliger (Fishbone cactus) which will produce large, scented flowers when mature. 

How to care for your Cactus -

Water:  Keep moist at all times, particularly during the warmer months. In winter, allow the top of the soil to dry out slightly before watering.

Light: Prefers medium light conditions.

Humidity: High humidity requirements. Mist frequently and stand in the shower or a tray of water from time to time.

Temperature: Needs average to warm conditions 16-25°C but will be OK down to 10°C for short periods.

Other info - 

Toxic to cats & dogs? No