Drosera x nagamotoi originally was created by Dr. nagamoto (who was Japanese I believe), and is a hybrid of D. anglica x D. spatulata. Plants produced were very beautiful but sterile.
Ivan Snyder induced polyploidy in this hybrid, granting fertility to the hybrid. His experiment is detailed at:
http://www.carnivorousplants.org/cpn/samples/Cult291Colch.htm
Ivan told me he sent seed to Dr. Nagamoto, but sadly the gentleman had passed away some time before. Still, this is a wonderful memorial to a great researcher, and Dr. Nagamoto's family appreciated this.
In culture the plant is quite easy, growing well and quickly from seed. Since there is temperate D. anglica in the parentage, the plant does experience a winter dormancy if placed in a natural light cycle. There are photos on the web of well developed hibernacula, but in my conditions the plant just slowed in growth. The leaves produced in the growing season became dewless, and the stipules became very long and prominent. After a couple of months, the plant resumed growth. If you have enough plants, I suggest that you try a hard winter dormancy, I think it would benefit the plant. So far the new growth on my plant is somewhat reduced, but this is typical for most droserae that have flowered and set abundant seed as this one has.
Seed germinated fairly well without stratification, but I would advise a cold stratification to enhance the germination.
I find this creation of Ivan's to be my favorite of his long list of "new species". You asked me privately if this plant was rare. Since it is a fairly new creation, it is very rare - especially in other countries, but it is spreading. It must be very exciting for Ivan to chart the progress of this species as it spreads through private collections around the world. The sterile D. x nagamotoi has been making the rounds since Dr. Nagamoto first made the hybrid, reproduced from leaf cuttings, and is more represented in collections, and hence may be considered less "rare".
There is also a D. x nagamotoi tetraploid from Ivan that I have not yet experienced.
I'll try to get a good resolution photo up here soon of this neat plant, but a smaller version may be seen on my website:
http://home.twcny.rr.com/tamlin/Photo%20pages/Photos16.htm
Congratulations on your new Sundew!