Gruul Basking Broodscale Combo wins by repeatedly sacrificing Basking Broodscale with Blade of the Bloodchief in play to generate infinite counters and mana, then converting that into a lethal drain via Glaring Fleshraker triggers. Their combo assembles quickly through Ancient Stirrings and Malevolent Rumble, so disruption is critical. Endurance is your premier disruption piece — flashing it in response to a sacrifice loop resets their graveyard, which can break the combo if any piece has been recycled through the yard. Surgical Extraction on Basking Broodscale or Blade of the Bloodchief after seeing one copy effectively ends their combo plan. Post-board they bring in Thief of Existence and Soulless Jailer to exile your creatures or prevent graveyard use, but your threats are largely in-hand so focus on deploying Emrakul to take control of their combo turn before they go off.