Yixlid Jailer

Most graveyard hate attacks the symptom: exile the threat, blank the engine, remove one card at a time. This 2/1 attacks the premise. By stripping every ability off every card in every graveyard, it doesn't answer flashback or recursion case by case; it sets a continuous static rule that the whole category has to live under. Dredge stops dredging because the dredge keyword is gone the moment the card is in the yard. Unearth, flashback, escape: all of them depend on the card retaining an ability while in the graveyard, and that is precisely what no longer happens. The effect is a rules-change, not a one-shot answer, so there is no resolution window for a graveyard ability to slip through: it has already ceased to exist. The boundaries are worth knowing precisely, because they are where opponents fight back. Leaves-the-battlefield triggers (death triggers) look back at the permanent's last state on the battlefield, so they fire normally; the creature had its ability before it ever reached the graveyard. And an effect with a newer timestamp wins under layer ordering: Snapcaster Mage grants flashback successfully, because its grant resolves after the Jailer's static effect was already applied. Then there's the body. It dies to anything that kills a 2/1, and the protection ends the instant it leaves; future cards entering the yard keep their abilities again. This is a hatebear that wants to be a global rules-change, and the lineage runs toward sturdier, bodyless takes: Leyline of the Void exiles only opponents' cards, while Rest in Peace exiles everyone's, both trading the fragile creature for permanence.