Nyorai kuenderera mberi kweiyi ndima - Kuburikidza nekutamba nhamba shoma yemitambo, Kostin akatorwa nekusarudzwa kwekupedzisira mumutambo wekutanga we2017 NHL Entry Draft
neSt. Louis Blues. Pakutanga akafunga kuti arambe achivandudza muRussia, Kostin akaitwa mushandi akasununguka mushure mekunge Dynamo Moscow yakamanikidzwa kusunungura vatambi vavo vese kuburikidza nekutyora mitemo yeKHL musi wa4 Chikunguru 2017. Zuva rakatevera, Kostin akabvuma chibvumirano chemakore matatu neSt. Louis Blues. Kostin akati aizosarudza kutamba muNHL nokuda 2017-18 mwaka, kunyange asingadi vanoshora kuenda American Hockey League (AHL), pamusoro duku League affiliate nokuda NHL; Zvisinei akanga asina kufarira kutamba WHL, kana chero muduku League.