Marvel’s Sins of Sinister was always meant to call back to small details of House of X/Powers of X, the founding text of the modern X-Men line. And yes, technically, Rasputin, a kickass genetic experiment who looks like a cross between Colossus and his sister Magik, was a “throwaway character,” destined to live only in a limited glimpse of a possible future timeline. But it’s not a slam. Characters are not necessarily less cool just because they don’t stick around — and Rasputin is a great example of the strengths of brevity.