You are the easiest person to fool.
A deck of eighty tricks the mind plays. Cognitive biases, logical fallacies, and the mental models that cut through them. Study the cards. Or tell the machine what's going on, and it names the tricks at work.
After Richard Feynman: "The first principle is that you must not fool yourself, and you are the easiest person to fool." A learning tool, not professional advice. Diagnose mode sends your text to an AI model to generate the reading; nothing is stored on this site's server. Every card links to the source it was drawn from.
You are the easiest person to fool. These are the eighty ways.
Describe what's going on. A decision you're circling, an argument you keep having, a deal that smells wrong. The machine reads it and deals the cards that apply.
A reflection, not a diagnosis. Tap a card for the full story and its source. For anything with real stakes, a qualified human beats a card deck.