Whenever a spell or ability an opponent controls destroys a noncreature permanent you control, you may destroy target permanent that opponent controls.
Enchant creature Enchanted creature can't attack. Threshold — Enchanted creature can't block as long as there are seven or more cards in your graveyard.
Destroy all creatures. They can't be regenerated. Threshold — If there are seven or more cards in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated.