Legion's End
Here is one of the best solutions to Bloodghast, Death's Shadow, Gravecrawler, and a whole army of tokens. Snapcaster Mage would be a great target for Legion's End as well.
The only drawback of this card is the sorcery speed, which is a bit slow for such an important effect. But even then there is no doubt that Legion's End will save you a ton of games that would've been easily lost if not for this card.
This is obviously a card designed to hit Dredge, and time will show how effective it is against other archetypes. So keeping it in sideboard would be the best idea for now.
Published Jul. 4th 2019