Boommobile, Emiel the Blessed, and Battered Golem

Prerequisites

• Boommobile on the battlefield
• Emiel the Blessed on the battlefield
• Battered Golem on the battlefield

Steps

1. Activate Boommobile's crew ability by tapping Battered Golem, causing Boommobile to become an artifact creature until end of turn
2. Activate Emiel by paying , blinking Boommobile
3. When Boommobile enters the battlefield, it and Battered Golem trigger
4. Resolve the Battered Golem trigger, untapping it
5. Resolve the Boommobile trigger, adding four mana of any color that can only be spent to activate abilities
6. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite creature LTB
• Infinite damage
• Infinite colored mana that can only be spent to activate abilities