In a small bowl, whisk together sour cream, lime juice, chopped cilantro, and 1 tablespoon of water to create the crema. Set aside.
In a large bowl, toss the shrimp with olive oil, chili powder, cumin, garlic powder, smoked paprika, salt, and black pepper until evenly coated.
Heat a large skillet over medium-high heat. Add the shrimp in a single layer and cook for 2-3 minutes per side until pink and opaque.
While the shrimp cooks, warm the tortillas in a dry skillet or over an open flame for 30 seconds per side.
Assemble the tacos by placing a portion of shredded cabbage on each tortilla, followed by 3-4 shrimp.
Drizzle the cilantro-lime crema over the tacos and serve immediately with extra lime wedges.