1. In a mixing bowl, combine olive oil, chili powder, cumin, and garlic powder. Add Mahi Mahi strips and coat well.
2. Heat a skillet over medium-high heat. Cook the fish for about 3-4 minutes on each side until cooked through.
3. Warm the corn tortillas in a separate skillet or microwave.
4. Assemble the tacos by placing fish strips on each tortilla. Top with shredded cabbage, a dollop of sour cream, a squeeze of lime juice, and chopped cilantro.