Fill a large bowl with arugula or greens. Mix in the salad ingredients: pomegranate seeds, tomatoes, cucumbers, clementines, sliced avocado, and pistachios.
Make the dressing: in a glass jar or container with a lid combine the oil, blood orange juice, red wine vinegar, dijon mustard, sea salt, and garlic powder. Shake until well combined and the dressing thickens a bit with the mustard.
Pour dressing over the salad ingredients and toss. Salt and pepper to taste. Serve immediately!