Heat coconut oil in a large skillet over medium-low heat. Add chili powder, garlic powder, cumin, and coriander; cook until fragrant, about 30 seconds. Add celery; cook and stir until softened, 3 to 5 minutes.

Add tomato, corn, oregano, and cilantro; stir to coat. Stir in black beans and salsa; bring to a simmer and cook for 10 to 15 minutes, adding water as needed to keep mixture saucy.

Off heat, stir in cooked rice until coated; season with salt.