As the judge, I declare the winner of this epic battle to be Momiji Inubashiri "White Tengu Wolf"! Firstly, Momiji's strength and defense are both Multi-Continent level, making it near impossible for Envy to land a significant blow on her. Her mastery of all weapons also gives her an advantage over Envy, as she can come up with various strategies to take him down. In terms of speed, Momiji is FTL which means she can move at incredible speeds, making it difficult for Envy to even keep up with her movements. In addition to her enhanced senses and acrobatics, she can easily dodge and evade any attack coming from Envy. Momiji's incredible regenerative abilities also work against Envy's Death Stare, which is his notable attack. Even if Envy were to land a hit, Momiji's regenerative abilities would allow her to recover quickly and continue the fight. Envy's hypnotizing and mind manipulation abilities may have been effective against other opponents, but Momiji's advanced senses and mental fortitude make her immune to such tactics. Envy's exoskeleton creation and electromagnetism manipulation through his tail may be impressive, but they are not enough to overcome Momiji's superior strength and defense. In conclusion, Momiji's overwhelming strength, defense, speed, mastery of weapons, and regenerative abilities make her the clear winner in this battle. Envy's skills and attacks were simply no match for her. Congratulations to Momiji Inubashiri "White Tengu Wolf" for emerging victorious!