Teemu Pulkkinen is a 25-year-old forward that was acquired by the Coyotes from the Minnesota Wild before the 2017 trade deadline in exchange for future considerations. Prior to that trade, he played 9 NHL games with the Wild and 47 AHL games with their Iowa-based affiliate.
The acquisition price for Pulkkinen was extremely cheap since future considerations is basically the NHL equivalent of writing an IOU. It is not unreasonable to speculate that Pulkkinen was meant to be part of the deal that sent Martin Hanzal and Ryan White to the Wild, which only just occurred the day before.