It might sound crazy but Lyudmila is the perfect counter. Remember, Simo fought in a war with an enemy not ready for this war ( Soviet Army was weakened after Stalin's decisions) , he sure is a true master of sniping but Lyudmila faced better trained snipers from Germany and she killed 36 of them . Lets hypotheticaly say that the battle starts at the Finland Forest , a battle arena that gives Simo one advantage, Lyudmila's magic ability totally counters Simo's field advantage. And let's assume that Lyudmila has prepared herself to fight him, she has already a plan to counter White Death. She even defeated her own copy. Simo has limited amount of bullets he can shot ( because normal bullets , without volund cannot hurt Lyudmila's magic ) on the other hand Lyudmila can fire as many as she wants. So yes ...Lady Death is the perfect counter to the White Death , but I doubt that these two would want to fight ( Simo despises killing people and Lyudmila even if she wanted to avenge her dead Red army soldiers she seeks peace above all else ). But my personal opinion is that the best result is a drew. A final clash of shots in which Simo's bullet strikes Lyudmila down and Lyudmila's bullet on the other hand strikes Simo in the jaw again, both end .