Colfenor, the Last Yew + Gutter Grime + Bartolomé del Presidio

Colfenor, the Last Yew

Gutter Grime

Bartolomé del Presidio

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

This loop transforms the sacrifice outlet Bartolomé del Presidio into a relentless engine by cycling zero-toughness or free-sacrificed creatures right back to your hand. As your sacrifices pile up, Gutter Grime scales larger with every iteration, generating an ever-growing Ooze token to feed back into the loop. Whenever that massive Ooze eventually hits the graveyard, Colfenor, the Last Yew steps in with its triggered ability to pluck your original creature card right back out of the graveyard and return it to your hand, ready to cast all over again.