Chalk Outline + Golbez, Crystal Collector + Cloakwood Swarmkeeper + Moss-Pit Skeleton

Chalk Outline

Golbez, Crystal Collector

Cloakwood Swarmkeeper

Moss-Pit Skeleton

How it works

1. Put a +1/+1 counter on a creature you control.
2. Moss-Pit Skeleton triggers, putting it from your graveyard onto the top of your library.
3. Chalk Outline triggers, creating a 2/2 Detective creature token and a Clue token.
4. When the Clue enters the battlefield, Golbez and Cloakwood Swarmkeeper trigger.
5. Resolve the Golbez trigger, putting Moss-Pit Skeleton from the top of your library into your graveyard.
6. Resolve the Cloakwood Swarmkeeper trigger, putting a +1/+1 counter on it.
7. Repeat from step 2.

This brilliant loop turns a single +1/+1 counter into an endless cycle of artifact and token generation by feeding Moss-Pit Skeleton's recursive graveyard ability right back into your deck. Whenever Moss-Pit Skeleton leaves your graveyard, Chalk Outline seizes the moment to create a 2/2 Detective token and a Clue token, which simultaneously fuels Golbez, Crystal Collector's surveil trigger and bulks up Cloakwood Swarmkeeper with fresh +1/+1 counters. As Golbez surveils the Skeleton back to the graveyard and Cloakwood Swarmkeeper triggers to place a new counter, the entire engine resets itself to keep the compounding value flowing indefinitely.