Valkyrie's Call + Simulacrum Synthesizer + Thermopod

Valkyrie's Call

Simulacrum Synthesizer

Thermopod

How it works

1. Cast the Vehicle by paying its mana cost.
2. When the Vehicle enters the battlefield, Simulacrum Synthesizer triggers, creating a 0/0 Construct artifact creature token that gets +1/+1 for each artifact you control.
3. Activate the Vehicle's crew ability by tapping the Construct, causing the Vehicle to become an artifact creature until end of turn.
4. Activate Thermopod by sacrificing the Vehicle.
5. When the Vehicle dies, Valkyrie's Call triggers, returning the Vehicle from your graveyard to the battlefield. It will not be an Angel because the Vehicle is no longer a creature and cannot gain creature types.
6. When the Vehicle enters the battlefield, Simulacrum Synthesizer triggers, creating a 0/0 Construct artifact creature token that gets +1/+1 for each artifact you control.
7. Repeat from step 3.

This infinite loop hinges on constantly cycling a Vehicle through the graveyard to repeatedly trigger Simulacrum Synthesizer for an endless army of growing Construct tokens. Each time the Vehicle enters the battlefield, the Synthesizer sees an artifact with mana value 3 or greater enter to fuel the creation, and Thermopod converts the crewed Vehicle's sacrifice back into red mana to keep the engine running. Finally, Valkyrie's Call catches the dying Vehicle and returns it straight to the battlefield, setting the stage for the whole cycle to repeat anew.