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The low mana cost makes it an effective target for a Whir of Invention to catch opponents by surprise and stop them from making explosive graveyard plays

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If no card is discarded, most likely because that player's hand is empty and an effect says they can't draw cards, the conniving creature does not receive a +1/+1 counter

Obviously, this is brutally strong and Teferi, Time Raveler is banned in multiple formats as a result