10 Major Details Marvel Just Revealed About Thor: Ragnarok
5. ...So We Can Probably Expect Infinity Stones To Play A Part
It's too much of a coincidence that the Grandmaster used to be the owner of the Mind Stone and that Thanos' big moment is approaching on the horizon quickly.
Surely his presence provides an opportunity to link to the Mad Titan? Though it would be something of a cop-out for it to be revealed that the Grandmaster is behind the war, it would be incredibly clever for him to actually be in possession of another Stone, wagering it on the Asgardian civil war in a game against Thanos.
It would fit the character, but there are alternatives. Currently the Tesseract is still on Asgard, meaning Thanos will have to go there at some point, and there's every chance the Grandmaster himself is on its trail having lost one Stone already. That race could be his game.