Gilder Bairn, Citanul Hierophants, and Zirda, the Dawnwaker

Prerequisites

• Gilder Bairn on the battlefield
• Citanul Hierophants on the battlefield
• Zirda, the Dawnwaker on the battlefield

Steps

1. Activate Gilder Bairn's ability from Citanul Hierophants by tapping it, adding
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on target permanent
3. Repeat

Results

• Infinite proliferate for permanents