several years ago I said goodbye to my own sanity

Probably not what was expected, but then I never do the expected if I can help it. For the prompt "CCS/Yotsubato! crossover".

Title: Yotsuba and Magic Cards
Series: Yotsuba to!
Length: 300 words
Genre: Humor?
Summary: A mysterious girl gives Yotsuba an idea for an art project.