if you're not having any luck finding one from card pack purchases, you can always bid on one/immediately buy one from the trade blocks. to do that:
go into the trading section from the hut main page.
click on the "search for item" option.
change the search type to "players".
change the collection type just beneath the search type to "HUT Live".
the results will be for the priciest auction items in the game. you do not have to equip one of the nhl players to unlock this. the minor leaguers will still cost a couple thousand coins to buy now, but they will unlock this for you.