Diplomacy with the Frost Giants has always been tricky. And includes disproportionate number of clubs.
Card text changed from "Few can stand in the presence of a Frost Giant for long. Even on the warmest day, the area around them remains sub-zero." to what is found in the nearby info box on an unknown date, but probably with Patch 1.5.1.
Like all Frost Spire cards, Frost Giant received a stats boost on July 25th, along with their rerelease. Its card set also changed to Trek to Iceholm.