Gilder Bairn, Song of Freyalise, and Biomancer's Familiar

Prerequisites

• Gilder Bairn on the battlefield
• Song of Freyalise on the battlefield
• Biomancer's Familiar on the battlefield

Steps

1. Activate Gilder Bairn by tapping it, adding
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on target permanent
3. Repeat

Results

• Infinite proliferate