[quote=@Kaggs]
You talking about when someone clutches a win through god-tier luck?
[/quote]

I mentioned it briefly in my reply to Calle. There's another trope that's somewhat common in YGO RPs where everyone has this 1 card that's unique to them/unique in general which kickstarts them into the plot. An example I can think of from an old one is everyone having a "Guardian" (term, not the archetype) monster that watches over them, and these guardians came together in a tournament and were drawn to fighting each-other for reasons.

Think the Numbers in ZeXal, or the Signer Dragons in 5D's.