Sultai Reanimator wants to fill the graveyard with threats like Overlord of the Balemurk and Ardyn then cheat them into play, so Strategic Betrayal is devastating since it exiles both a creature and their entire graveyard, cutting off recursion. The extra Deadly Cover-Up gives us a second sweeper that can also exile a key card from their graveyard via evidence collection. Stock Up comes out since card selection is less important than proactively attacking their graveyard plan. Keep Duress in to strip noncreature enablers before they connect.