A mix of League's trailers edited with Infinity War style.
No Copyrights Intended.

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Another version:    • League of Legends: Infinity War  

Sources:
Avengers - Infinity War trailer
Awaken - League of Legends
The Climb - League of Legends
Xayah and Rakan - Wild Magic - League of Legends
Ryze - Call of Power - League of Legends
Jhin - Mind of the Virtuoso - - League of Legends
The Light Within - Elementalist Lux - League of Legends
Aurelion Sol - The Star Forger Returns - League of Legends
Aatrox - World Ender - League of Legends
Varus - As We Fall - League of Legends Music
Welcome Aboard - Odyssey Animated Trailer - League of Legends