Crackdown Construct, and Chimeric Idol

Prerequisites

• Crackdown Construct on the battlefield
• Chimeric Idol on the battlefield

Steps

1. Activate Chimeric Idol by paying , tapping all lands you control, causing Chimeric Idol to become a 3/3 Turtle artifact creature until end of turn
2. Crackdown Construct triggers, gaining +1/+1 until end of turn
3. Repeat

Results

• Infinitely large Crackdown Construct until end of turn