Liliana's Whispers

As long as a creature with hexproof is in your graveyard, creatures your opponents control lose hexproof and can't have or gain hexproof. The same is true for flying, deathtouch, double strike, haste, indestructible, lifelink, menace, reach, skulk, trample, and vigilance.
"Shh... Don't waste your breath trying to call for help. Listen to the soothing voices of your brothers and sisters whose souls still linger in this world. Let their cries guide you to your next life in the underworld."