Nylea's Disciple gains life equal to our devotion to green, which is typically high in this deck given all the green mana symbols on our creatures, helping us survive Avenging Hunter and Boarding Party-fueled cascade beatdown. Gruul Ponza is a land-destruction ramp deck (Mwonvuli Acid-Moss, Thermokarst) racing to big threats, so this becomes a battle of who ramps faster and bigger; our wall-based mana engine is resilient to their land destruction since Axebane Guardian and Overgrown Battlement generate mana without needing many lands. Bring in extra lifegain to buy time against their Writhing Chrysalis and Avenging Hunter's initiative pressure. Keep the full ramp and payoff suite since this is fundamentally a mana race we're built to win.