Kheru Goldkeeper, Sarinth Steelseeker, Cloakwood Swarmkeeper, and Moss-Pit Skeleton

Prerequisites

• Kheru Goldkeeper on the battlefield
• Sarinth Steelseeker on the battlefield
• Cloakwood Swarmkeeper on the battlefield
• Moss-Pit Skeleton in the graveyard

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 When the Treasure enters the battlefield, Sarinth Steelseeker and Cloakwood Swarmkeeper trigger
4. Resolve the Sarinth Steelseeker trigger, putting Moss-Pit Skeleton from the top of your library into your graveyard
5. Resolve the Cloakwood Swarmkeeper trigger, putting a +1/+1 counter on it
6. Repeat from step 2

Results

• Infinite ETB
• Infinite colored mana
• Infinite Treasure tokens
• Infinite +1/+1 counters on a creature