Toss a coin and call it. If you call it right, all of your opponent's cards in the Graveyard are removed from play immediately. If you call it wrong, send a number of cards equal to the number of cards in your opponent's Graveyard from your Deck to your Graveyard.
It’s a win-win situation. Call it right, you can banish stuff like the survivals end, spellbooks, or other problematic cards. Call it wrong, you mill and thin your deck. Imagine playing dinos and you mill a giant Rex and survivals end, that’s a plus for you.