Mortuary + Bloodflow Connoisseur + Shield Sphere + Gwenom, Remorseless

Mortuary

Bloodflow Connoisseur

Shield Sphere

Gwenom, Remorseless

How it works

1. Activate Bloodflow Connoisseur by sacrificing Shield Sphere
2. When Shield Sphere dies, Mortuary triggers, putting Shield Sphere from your graveyard onto the top of your library.
3. Resolve the Bloodflow Connoisseur ability.
4. Cast Shield Sphere from the top of your library by paying 0 life.
5. Repeat.

This intricate loop uses Mortuary as a mechanical bridge, taking advantage of the fact that when you sacrifice Shield Sphere to Bloodflow Connoisseur, Mortuary instantly intercepts the creature and places it directly back on top of your library. From there, Gwenom, Remorseless grants you the crucial ability to play spells straight from the top of your library for a life-payment cost of zero, allowing you to instantly replay the free 0-mana Shield Sphere. As you repeat this cycle, Bloodflow Connoisseur grows infinitely large while generating an endless stream of death, sacrifice, and entry triggers.