I'm waving my magic wand in Marvel

Introduction: I am a great alchemist and the supreme Witch King in the magical world.Loki sees me as a nightmare, Thanos sees me as a thorn in his side, Thor...why do you call me brother-in-law?You can call me by my name, John Wick.My motto is: "There is nothing that Expelliarmus can't solve. If so, add an Ashwada Kedavra."