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Easy. Take the "snapping" or "grasping" hand from Marvel Legends Thanos and just stick it in. Best case scenario, I have a tiny Infinity Gauntlet, worse case I have Thanos' tiny disembodied hand inside a tiny Infinity Gauntlet.
In either case, I'm pretty sure that the size of Infinity Gems doesn't effect their potency, so I'm able to control reality with something only twice the size of a thimble. I might even put it on my cockhead, who's gonna stop me?