Colfenor, the Last Yew + Gutter Grime + Phantom Train

Colfenor, the Last Yew

Gutter Grime

Phantom Train

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

This clever loop turns a fragile zero-toughness creature into an infinite engine, powered entirely by Colfenor, the Last Yew, Gutter Grime, and Phantom Train. As your free-to-cast creature repeatedly hits the graveyard—either instantly to state-based actions or fed to Phantom Train—Gutter Grime steps in to generate a growing Ooze token with each death. You then sacrifice those Ooze tokens to Phantom Train, which conveniently triggers Colfenor, the Last Yew to pull your original creature card right back out of the graveyard and into your hand. Meanwhile, Phantom Train stacks up an endless pile of +1/+1 counters, creating an army of infinitely massive tokens while drowning the board in infinite death and sacrifice triggers.