Tormod's Crypt exiles their graveyard before a Hermit Druid activation mills their whole deck, denying Volrath's Shapeshifter a creature card to copy and shutting off Unearth or Animate Dead as reanimation targets. Xantid Swarm pressures their low life total while flying under most of their removal, and once it connects it stops them from casting the Unearth or instant-speed combo piece they need on their turn. Parallax Wave is a weak answer since their real threats arrive via Hermit Druid's graveyard combo rather than attacking creatures, so exiling one body does little to stop the kill. Abeyance is too narrow here, since their key combo pieces are activated abilities and creature casts rather than instants/sorceries it can stop.