Mortuary + Aetherflux Reservoir + Umbral Collar Zealot + Gwenom, Remorseless

Mortuary

Aetherflux Reservoir

Umbral Collar Zealot

Gwenom, Remorseless

How it works

1. Activate Umbral Collar Zealot by sacrificing a creature with mana value 1 or less.
2. When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library.
3. Resolve the Umbral Collar Zealot ability.
4. Cast the creature from the top of your library by paying 1 life.
5. Aetherflux Reservoir triggers, causing you to gain 1 life
6. Repeat.

This loop relies on Gwenom, Remorseless to let you cast cheap creatures directly off the top of your library for a sliver of life instead of mana. When you sacrifice that creature to Umbral Collar Zealot, Mortuary instantly intercepts it on the way to the graveyard and places it right back on top of your library where Gwenom can play it again. Each iteration of this cycle triggers Aetherflux Reservoir, which easily offsets the life paid to Gwenom while rapidly building a lethal storm count and pumping up your life total to fuel Aetherflux Reservoir's direct-damage ability.