The goal is to resolve March From the Tomb with 4 Kalistra Healers in your graveyard. Your opponent will lose 16 life and you will gain 16 life when the Healers enter the battlefield due to their ability. Pulling the combo off is a guaranteed win in almost all match ups.
Here’s the deck list
4 Kalastria Healer
4 March from the Tomb
3 Dark Petition
4 Evolutionary Leap
2 Retreat to Hagra
3 Retreat to Emeria
4 Evolving Wilds
9 Forest
6 Swamp
4 Plains
4 Seek the Wilds
4 Seer’s Lantern
4 Read the Bones
2 Bligh