Angel of Harvest

When Angel of Harvest enters the battlefield, destroy all green lands you don't control. You gain that much life.
At the beginning of your upkeep, target opponent loses life equal to the number of green lands that entered the battlefield since your last upkeep. If no green lands entered, Angel of Harvest gets +1+1.
If the lands are burned in Maguma's fires, then no one can survive. I can't survive.