Blossoming Tortoise, Crackdown Construct, and Mutavault

Prerequisites

• Blossoming Tortoise on the battlefield
• Crackdown Construct on the battlefield
• Mutavault on the battlefield

Steps

1. Activate Mutavault's second ability by paying , causing it to become a 2/2 creature with all creature types in addition to its other types until end of turn
2. Activate Mutavault's second ability by paying
3. Crackdown Construct triggers, giving itself +1/+1 until end of turn
4. Repeat from step 2

Results

• Infinitely large Crackdown Construct until end of turn