Colfenor, the Last Yew + Gutter Grime + Shilgengar, Sire of Famine

Colfenor, the Last Yew

Gutter Grime

Shilgengar, Sire of Famine

How it works

1. Cast the creature card in your hand by paying 0.
2. Either that creature dies as a state-based action due to having zero toughness, or activate Shilgengar by sacrificing that creature.
3. Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
4. Activate Shilgengar by sacrificing the Ooze.
5. When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand.
6. Resolve the Shilgengar abilities, creating a Blood token each time.
7. Repeat.

This loop relies on an elegant feedback loop where Shilgengar, Sire of Famine acts as the engine, sacrificing your creatures to fuel its Blood-producing abilities. Gutter Grime watches this carnage unfold, steadily growing larger and churning out an Ooze token every time a nontoken creature dies to feed back into Shilgengar's altar. Meanwhile, Colfenor, the Last Yew uses its trigger to continuously rescue your fallen creature card from the graveyard, since its lesser toughness neatly qualifies it to return to your hand, ready to be cast and sacrificed all over again.