Here's a video essay that explains the narrative device known as deus ex machina, how to spot it, its strengths, and its weaknesses.
The 15 Biggest Deus Ex Machina Moments In Film History, Ranked By How Crazy They Were
The best deus ex machina : r/BattleNetwork
How I sometimes feel about complaints over Deus Ex Machina in this sub : r/TheLastAirbender
What is a Trope — Definition and Examples in Movies
What is Deus Ex Machina? Definition & Examples - The Art of Narrative
10 Worst Cases Of Deus Ex Machina That Ruined The Anime
Deus Ex Machina: Definition, Usage & Examples
Deus Est Machina - TV Tropes
What is the relationship between 'Deus ex Machina' and 'Ghost in the Machine?' - Quora
Deus Ex Machina : When To Avoid It and How To Make It Work
Deus Ex Machina: The Trope That Defines Lazy Writing in Anime
What is deus ex machina? Is it bad to use it? - Quora
Ex Machina: A Movie Of Machines About Human Ambition, by Lidia Zuin
Lion Turtle (To the people who think he's Deus ex Machina) : r/TheLastAirbender
Deus Ex Machina: The Trope That Defines Lazy Writing in Anime