Preheat oven to 400 degrees F (200 degrees C).
Spread 1/2 the tortilla chips into a 10 1/2×6-inch baking dish; sprinkle with 1/2 the Mexican cheese blend. Layer 1/2 the black beans over cheese layer. Repeat layering with remaining tortilla chips, Mexican cheese blend, and black beans. Spread onion over bean layer; top with salsa verde and salsa casera.
Bake in the preheated oven until cheese is melted, about 20 minutes. Top nachos with sour cream; serve with lime wedges.
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