Tazri, Stalwart Survivor, Gilder Bairn, and Agatha of the Vile Cauldron

Prerequisites

• Tazri, Stalwart Survivor on the battlefield
• Gilder Bairn on the battlefield
• Agatha of the Vile Cauldron on the battlefield
• Gilder Bairn does not have summoning sickness
• Agatha of the Vile Cauldron has power 2 or greater

Steps

1. Activate Gilder Bairn by tapping it, adding that can only be spent to activate abilities
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on target permanent
3. Repeat

Results

• Infinite proliferate