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In your case, probably the bell altar. Find an altar with a bell. Go to it, and you'll be able to corrupt cards for a potentially steep price.
Its just like any other card you get during a run. It has the chance to be yellow or blue. And a low chance to be corrupted.
You never keep any card you get between runs.
Corrupted is basically the yellow and blue upgrade combined together, though sometimes that's a worse upgrade than the others.