Puree 4 cups ice, 1/2 cup tequila, 1/4 cup each orange liqueur and lime juice and 1 tablespoon agave nectar in a blender until smooth, adding more ice if necessary. Transfer to a pitcher. Add 4 cups more ice, 3/4 cup chilled red wine, 1/2 cup fresh orange juice, 1/4 cup lemon juice and 1 tablespoon agave nectar to the blender; puree, adding more ice if necessary. Spoon the tequila mixture and the red wine mixture into 4 glasses to create layers.
Photograph by Levi Brown