Defiler of Flesh + Aetherflux Reservoir + Gravecrawler + Carrion Feeder

Defiler of Flesh

Aetherflux Reservoir

Gravecrawler

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Gravecrawler, putting a +1/+1 counter on Carrion Feeder.
2. Cast Gravecrawler from your graveyard by paying 2 life.
3. Aetherflux Reservoir and Defiler of Flesh trigger.
4. Resolve the Aetherflux Reservoir trigger, causing you to gain 1 life for each spell you've cast this turn.
5. Resolve the Defiler of Flesh trigger, giving target creature +1/+1 and menace until end of turn.
6. Repeat.
7. Once you have infinite life, you may activate Aetherflux Reservoir's ability to deal infinite damage to any target(s).

This cunning loop turns the humble undead into a lethal storm engine, fueled entirely by life manipulation. By sacrificing Gravecrawler to Carrion Feeder, you set up the graveyard casting condition required to bring it right back, a loop heavily subsidized by Defiler of Flesh allowing you to pay 2 life instead of black mana. Every single iteration of this recycling process feeds the passive storm tracking of Aetherflux Reservoir, steadily climbing your life total with each cast until you can safely spend 50 of that buffer to incinerate any target.