In a large bowl, mix the black beans, pinto beans, white corn, green chilies, jalapeno, red and green peppers, red onion, celery, and cilantro together.
To make the dressing, stir the rice vinegar, olive oil, sugar, cumin, and garlic powder together in a small saucepan. Bring to a boil, then remove from heat and cool. Pour dressing over bean mixture and toss to mix evenly.