Jennifer Kale (why? she works with Man-thing? She's Ghost Rider's cousin?)
Speaking to this issue, Jennifer Kale is probably the most powerful available magician who's amicable and somewhat easy to persuade/coerce to a "serve your country" agenda, as opposed to (1) experienced and obligated by other duties (Stephen Strange, Merlin), (2) senile (the Aged Ghengis), (3) a scary black magician/super-villain (Kaluu, Morgan Le Fay, Baron Mordo, Illyanna Rasputin, Marie Laveau), or (4) Canadian and ethnic (Elizabeth Twoyoungmen).