Graveyard Prevention

Always-on hate pieces that prevent the graveyard from functioning as a resource for opponents. Some replace the graveyard outright by exiling cards that would be put there, as with Rest in Peace and Leyline of the Void; others lock interaction with the zone, as with Grafdigger's Cage stopping casts and reanimation from graveyards, Dauthi Voidwalker siphoning opponent cards to exile, and Ground Seal blocking targeting of graveyard cards. Distinct from control.search_hate, which shuts down library searching, and from control.stax, which denies untap and mana resources; this is specifically the graveyard-zone shutoff layer. Cards that merely exile a graveyard once, or that use their own graveyard, do not belong here.