Saute garlic, onion and celery until onion is translucent. Add carrots, vegetable broth and vegetable juice. Bring to a boil, lower heat and simmer for 10 minutes. Add zucchini and simmer 5 more minutes. Carefully spoon mixture into blender. Blend until there are very few chunks (you should be able to see specks of dark green zucchini and orange carrots). Return to stovetop. Add soy milk. Bring to a low boil and add nutritional yeast, salt and pepper to taste.