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Including a card like this solely to copy your own stuff (thus making it more predictable) makes the card much weaker due to the need of having something good in play already to copy and making the card suffer from the win more issue of many good looking cards

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A Putrid Imp is the "best" discard outlet from a pure combo perspective

That downside isn't enough to knock this card off our list - because MTG sliver decks are heavily focused on creatures, this effect will always be worse for your opponents than it is for you