Gruul Ponza plays no instant spells to counter with Dispel in any relevant way beyond their rare instant, so trimming it slightly for proactive answers is reasonable. Breath Weapon deals 2 damage to each non-Dragon creature, which cleans up their Eldrazi Spawn tokens and can help against a wide board from Boarding Party cascades, though it won't kill their bigger threats like Annoyed Altisaur (6/5) or Bramble Wurm-sized bodies. Counterspell is at its best here stopping their land destruction spells like Mwonvuli Acid-Moss and Thermokarst before they can cripple your mana. Keep Skred in since it scales well against their early creatures like Arbor Elf and Eldrazi Repurposer.