Meria, Scholar of Antiquity, Pili-Pala, and Heartstone

Prerequisites

• Meria, Scholar of Antiquity on the battlefield
• Pili-Pala on the battlefield
• Heartstone on the battlefield

Steps

1. Activate Meria's first ability by tapping Pili-Pala, adding
2. Activate Pili-Pala by paying and untapping it, adding one mana of any color
3. Repeat

Results

• Infinite colored mana