Nepenthes naga (North Sumatra)
Avery impressive relatively new species from the N. bongso - N. izumiae - N. densiflora group.
It's notable for the forked appendage near the tip of the pitcher-lid.
A typical highland plant. Not difficult as long as the right climate is provided. Cool nights should be provided to grow this plant.
As a substrate I’d suggest a more open mix. Good components for such mixes are Sphagnum-moss, horticultural perlite, pine bark plus a bit of peat moss. Drainage is recommended.