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The number of cards you discard is equal to Horrid Shadowspinner's power at the time you chose to draw cards, even if another effect changed the number of cards you drew or in the unusual case where Horrid Shadowspinner's power has changed since you chose to draw cards

For learning about MTG oddities and rarities check out: A note on nomenclature from the creator of this website Over the course of collecting Magic the Gathering misprints I have found there to be a wide range in the words used to describe errors and their perceived names

This Gem Loader Premium Graded Card Binder is on another level of quality altogether

But they are all common or uncommon, which makes acquiring their singles much easier