Add the cashews, ¾ cup water, nutritional yeast, pickle, pickle brine, dill, onion powder, garlic powder, salt, and pepper to your blender. Blend until completely smooth, stopping to scrape the sides as needed. Store in an air-tight container in the fridge for up to a week. The dressing gets thicker as it cools, great for dipping! If needed you can always add more water to thin as desired.