Crackdown Construct, and Frenetic Sliver

Prerequisites

• Crackdown Construct on the battlefield
• Frenetic Sliver on the battlefield

Steps

1. Activate Frenetic Sliver's ability
2. Crackdown Construct gets +1/+1 until end of turn
3. With the ability on the stack, repeat

Results

• Infinitely large Crackdown Construct