Moss-Pit Skeleton, Chalk Outline, Cloakwood Swarmkeeper, and Rook Turret

Prerequisites

• Moss-Pit Skeleton in the graveyard
• Chalk Outline on the battlefield
• Cloakwood Swarmkeeper on the battlefield
• Rook Turret on the battlefield

Steps

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, Rook Turret and Cloakwood Swarmkeeper trigger
5. Resolve the Rook Turret 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

Results

• Infinite ETB
• Infinite creature tokens
• Infinite self-discard triggers
• Infinite draw triggers
• Infinite Clue tokens
• Infinite +1/+1 counters on a creature