Rex, Cyber-Hound, Pili-Pala, and Accomplished Alchemist

Prerequisites

• Rex, Cyber-Hound on the battlefield
• Pili-Pala in exile
• Accomplished Alchemist in exile
• You have gained at least 2 life this turn
• Rex does not have summoning sickness
• Accomplished Alchemist and Pili-Pala exiled with a brain counter on them

Steps

1. Activate Rex using Accomplished Alchemist's ability by tapping it, adding at least two mana of any color
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