Moss-Pit Skeleton + Chalk Outline + Cloakwood Swarmkeeper + Transplant Theorist

Moss-Pit Skeleton

Chalk Outline

Cloakwood Swarmkeeper

Transplant Theorist

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 and Detective enter the battlefield, Transplant Theorist and Cloakwood Swarmkeeper trigger.
5. Resolve the Transplant Theorist trigger, drawing Moss-Pit Skeleton from your library, and then discarding it.
6. Resolve the Cloakwood Swarmkeeper trigger, putting a +1/+1 counter on it.
7. Repeat from step 2.

This clever loop feeds on itself by turning the act of adding counters into a self-sustaining engine of creation and discard. Whenever a +1/+1 counter is placed on a creature—bolstered passively by Cloakwood Swarmkeeper growing larger from every new arrival—Moss-Pit Skeleton is pulled from your graveyard to the top of your library. Meanwhile, Chalk Outline turns the Skeleton leaving your graveyard into a flood of tokens, generating both a Detective and a Clue token. Transplant Theorist harnesses those entering artifacts to loot through your deck, drawing the discarded Moss-Pit Skeleton right back into your hand or putting it into the graveyard to repeat the cycle infinitely.