Like most aroids, the leaves of the rhaphidophora decursiva plant change greatly as it matures from a juvenile to a mature plant.  

Similar to the rhaphidophora tetrasperma, the decursiva is also a climbing plant whose leaves grow larger and develop deep splits as it matures.  The splits of the mature decursiva are so deep they look almost like large palm leaves in a deep glossy green color.   

Your rhaphidophora decursiva plant will mature best with a climbing support, bright indirect light, and when allowed to dry out between watering.