Eldrazi presents a wall of big colorless bodies like Reality Smasher, Thought-Knot Seer, and Eldrazi Linebreaker, most of which dodge Fatal Push's mana-value restriction, so Massacre's -2/-2 is a much better rate, cleanly killing Glaring Fleshraker and any Eldrazi Spawn/Scion tokens while trading with smaller threats. Barrowgoyf's deathtouch and lifelink let it profitably block or race their large ground creatures, and it grows quickly off the graveyard fuel both decks generate. Watch for Chalice of the Void on 1 shutting off your one-drops like Fatal Push and Thoughtseize, which is part of why we trim a copy of Fatal Push. Ghost Quarter, Pithing Needle, and Skateboard aren't impactful against their big, resilient creature base.