Rex, Cyber-Hound, Pili-Pala, and Selvala, Heart of the Wilds

Prerequisites

• Rex, Cyber-Hound on the battlefield
• Pili-Pala in exile
• Selvala, Heart of the Wilds in exile
• available

Steps

1. Activate Rex using Selvala's ability by paying and 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