One of the most interesting prospects in the Calgary Flames system, to me, is Rushan Rafikov. He was originally drafted by the organization in the seventh (and final) round of the 2013 NHL Draft. Since being selected in that draft, he's only come over to North America a couple of times for tournaments and is the only prospect in the organization yet to attend any kind of Flames camp.
He has instead been developed in the Russian system, most recently signing a two-year contract with the other team that drafted him, the KHL's Lokomotiv Yaroslavl.. I'm not sure that was a great decision on his part.