Molten Echoes + Cordial Vampire + Phyrexian Altar + Dusk Legion Sergeant

Molten Echoes

Cordial Vampire

Phyrexian Altar

Dusk Legion Sergeant

How it works

1. Cast Dusk Legion Sergeant by paying 1.
2. When Dusk Legion Sergeant enters, Molten Echoes triggers, creating a token copy of Dusk Legion Sergeant with haste.
3. Activate the token Dusk Legion Sergeant by sacrificing it.
4. When the Dusk Legion Sergeant token dies, Cordial Vampire triggers, putting a +1/+1 counter on each Vampire you control.
5. Resolve the token Dusk Legion Sergeant's ability, giving nontoken Vampires you control persist until end of turn.
6. Activate Phyrexian Altar by sacrificing another nontoken Vampire with base toughness 2 or higher, adding 1.
7. When the Vampire dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
8. When the Vampire enters, Molten Echoes triggers, creating a token copy of it with haste.
9. Activate Phyrexian Altar by sacrificing Dusk Legion Sergeant, adding .
10. When Dusk Legion Sergeant dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
11. Repeat from step 2.

This loop transforms a simple sacrifice outlet into an engine by letting your creatures continually recycle themselves through the graveyard. Phyrexian Altar provides the necessary mana while harvesting your board, and Cordial Vampire ensures that your creatures grow stronger with every single death that occurs. Meanwhile, Molten Echoes acts as a cloning press every time a Vampire enters the battlefield, feeding right back into the Altar, while Dusk Legion Sergeant grants the crucial persist ability that allows your nontoken Vampires to keep cheating death.