Rex, Cyber-Hound, Pili-Pala, and Karametra's Acolyte

Prerequisites

• Rex, Cyber-Hound on the battlefield
• Pili-Pala in exile
• Karametra's Acolyte in exile
• Your devotion to green is at least two
• Rex does not have summoning sickness
• Karametra's Acolyte and Pili-Pala exiled with a brain counter on them

Steps

1. Activate Rex using Karametra's Acolyte's ability by tapping it, adding at least
2. Activate Rex using Pili-Pala's ability by paying and untapping it, adding one mana of any color
3. Repeat

Results

• Infinite colored mana