I've never heard the expression "to play one's Uno card." Is this a play on "to play one's Trump card"? I can understand why this phrasing could cause confusion, but want to make sure I'm not missing something.
https://knowyourmeme.com/memes/uno-reverse-card
Trump attacked Iran thinking that this would somehow be good for the US, except it's weakening the petrodollar because it's pushed Iran to simply accept Yuan for oil.
In Uno, you're supposed to say ‘Uno’ as you play your second to last card (indicating you are close to winning).