Crackdown Construct, Song of Freyalise, and Torchling

Prerequisites

• Crackdown Construct on the battlefield
• Song of Freyalise on the battlefield
• Torchling on the battlefield
• Torchling does not have summoning sickness
• Song of Freyalise has one or two lore counters on it

Steps

1. Activate Torchling by tapping it, adding
2. Activate Torchling's first ability by paying
3. Crackdown Construct triggers, giving itself +1/+1 until end of turn
4. Resolve the Torchling ability, untapping it
5. Repeat

Results

• Infinitely large Crackdown Construct until end of turn