Sultai Reanimator depends on graveyard value from Bringer of the Last Gift, Overlord of the Balemurk, and Oblivious Bookworm to fuel its recursive plan, so Rest in Peace shuts down the entire strategy by exiling graveyards on entry and continuing to exile cards going forward. Erode gives clean removal for their bigger threats like Ardyn, the Usurper or a reanimated body. Burst Lightning is too small against their large creature bases, so it comes out in favor of graveyard disruption. Prioritize landing Rest in Peace as early as possible since this matchup is largely decided by whether their engine gets to function.