Crackdown Construct, and Wandering Fumarole

Prerequisites

• Crackdown Construct on the battlefield
• Wandering Fumarole on the battlefield
• available

Steps

1. Activate Wandering Fumarole's ability so that it becomes a creature
2. Activate it to switch its power and toughness infinite times to get infinite Construct triggers
3. Repeat

Results

• Infinitely large Crackdown Construct until end of turn