Moss-Pit Skeleton, Kheru Goldkeeper, Cloakwood Swarmkeeper, and Skyswimmer Koi

Prerequisites

• Moss-Pit Skeleton in the graveyard
• Kheru Goldkeeper on the battlefield
• Cloakwood Swarmkeeper on the battlefield
• Skyswimmer Koi 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. Kheru Goldkeeper triggers, creating a Treasure token
4. When the Treasure enters the battlefield, Skyswimmer Koi and Cloakwood Swarmkeeper trigger
5. Resolve the Skyswimmer Koi 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 colored mana
• Infinite self-discard triggers
• Infinite draw triggers
• Infinite Treasure tokens
• Infinite +1/+1 counters on a creature