If the Conniving player discards a nonland card with this action, they put a +1/+1 counter on that creature
If nothing else this probably works as a board wipe, as not many decks can sacrifice 5 creatures and have a board presence remaining
Add on the inclusion of the Support keyword to Huey, Savvy Nephew - which means that whenever the card quests you can add its willpower to another character in play - and getting these three nephew cards into your next sapphire deck is a great approach
Secondly, when a creature enters from your graveyard, you give a +1/+1 counter to all of your creatures
HeiHei Not-so-Tricky Chicken could take a slot or two as a counter-measure for both Diablo and Fishbone Quill/Lucky Dime in the Sapphire mirror
If youve got a way to shuffle your library afterward, those bad cards are gone for good, and youll keep the best stuff