Mix paprika, oregano, garlic powder, onion powder, salt, and black pepper together in a bowl; rub evenly over roast.
Arrange potatoes, carrots, celery, and onions in the bottom of a slow cooker. Place roast atop vegetables.
Whisk beef broth, Marsala wine, and gravy mix together in a bowl; pour over roast and vegetables.
Cook on Low until meat is fully cooked and vegetables are tender, about 8 hours (or on High for 5 hours).
Strain sauce into a bowl and whisk with flour until thickened. Serve on the side of roast and vegetables.
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