Gilder Bairn, Cryptic Trilobite, and Song of Freyalise

Prerequisites

• Gilder Bairn on the battlefield
• Cryptic Trilobite on the battlefield
• Song of Freyalise on the battlefield

Steps

1. Activate Song of Freyalise by tapping Gilder Bairn, adding one mana
2. Activate Gilder Bairn by paying and untapping it, doubling each counter on Cryptic Trilobite
3. Activate Cryptic Trilobite as many times as necessary by removing counters from it, adding at least two mana
4. Repeat from step 2
5. Once you have infinite counters on Cryptic Trilobite, you may instead double the counters on any other permanents

Results

• Infinite colorless mana that can only be spent to activate abilities
• Infinite proliferate for permanents
• Infinite +1/+1 counters on a creature