In a bowl, add red kidney beans, chickpeas, corn, red bell pepper, cilantro leaves, onion, and celery stem. Mix them and place the bowl aside.
Take another bowl and add garlic cloves to it. Also, add coriander powder, cumin powder, salt, and vinegar to it and mix.
Now, add oil and black pepper to the garlic mixture and mix it well. Add this dressing to a salad bowl and toss the ingredients so everything gets covered.
Put the salad in the refrigerator for some time and serve.