A Fool Is Ignorant but Useful

A forgotten law of the universe: outside of knowledge, everything is fiction. In this world locked by the "observer effect", only the Fool card is the only loophole - the holder cannot be "defined" and is therefore immune to all extralogical existences. Igna, a stranger without even a magic circuit, holds a Fool's card that grows. When the witch's curse, the whispers of the ancient gods, and even the rules of the world themselves began to target him, he discovered that those who couldn't kill him just proved that they "didn't exist" at all. And every time he takes a step forward, new images will appear on the cards, as if the escape itself is being painted into an upside-down prophecy.