In a large bowl, beat together sour cream, cream cheese, buffalo sauce, and lime juice with an electric mixer.
Fold in cheese, corn, cilantro, and cumin.
Grease an 8-10 inch cast iron or enameled skillet with butter, and spread your corn mixture into it evenly.
Top with a layer of pepper jack, feta, and Tajin, then bake at 350 degrees for 20 minutes, or until top is bubbly and starts to turn golden brown.
Remove from oven, sprinkle with cilantro, feta, and sliced limes. Serve warm with tortilla chips.