Spreading Plague, Painter's Servant, and Eldrazi Monument

Prerequisites

• Spreading Plague on the battlefield
• Painter's Servant on the battlefield
• Eldrazi Monument on the battlefield
• Any color chosen with Painter's Servant

Steps

1. Whenever a creature enters the battlefield, Spreading Plague triggers, destroying all creatures, as they all share a color due to Painter's Servant
2. Because Eldrazi Monument gives your creatures indestructible, only your opponents' creatures are destroyed

Results

• Destroy all creatures opponents control whenever a creature enters the battlefield