Firion, Wild Rose Warrior, and Crackdown Construct

Prerequisites

• Firion, Wild Rose Warrior on the battlefield
• Crackdown Construct on the battlefield

Steps

1. Cast the Equipment by paying its mana cost
2. When the Equipment enters the battlefield, Firion triggers, creating a token copy of the Equipment whose equip abilities cost less to activate
3. Activate the Equipment token's equip ability by paying , targeting Crackdown Construct
4. Crackdown Construct triggers, giving it +1/+1 until end of turn
5. Resolve the Equipment's ability, attaching it to Crackdown Construct
6. Repeat from step 3

Results

• Infinitely large creature until end of turn