Colfenor, the Last Yew + Gutter Grime + Carrion Feeder

Colfenor, the Last Yew

Gutter Grime

Carrion Feeder

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 Carrion Feeder by sacrificing that creature.
3. Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
4. Activate Carrion Feeder by sacrificing the Ooze.
5. When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand.
6. Resolve the Carrion Feeder abilities, putting a +1/+1 counter on it each time.
7. Repeat.

This clever loop turns Colfenor, the Last Yew into a recursive engine by exploiting the exact toughness threshold of your fallen creatures. As you repeatedly sacrifice and recycle your threat, Gutter Grime scales its growing Ooze tokens to provide the exact fodder needed to feed Carrion Feeder's appetite. Because the Oozes enter with toughness tied to the slime counters, sacrificing them lets Colfenor's triggered ability find and return your original zero-toughness creature card right back to your hand, fueling infinite sacrifices and pumping Carrion Feeder to astronomical proportions.