Valkyrie's Call + Simulacrum Synthesizer + Phyrexian Altar

Valkyrie's Call

Simulacrum Synthesizer

Phyrexian Altar

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 Phyrexian Altar 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 brilliant loop uses a Vehicle's ability to shift between artifact and creature states to feed an infinite cycle of sacrifice and rebirth. By channeling Phyrexian Altar, you sacrifice the crewed Vehicle for mana, which instantly triggers Valkyrie's Call to pull it right back from the graveyard. Every time that Vehicle touches the battlefield, Simulacrum Synthesizer notices the large artifact arriving and pumps out another massive Construct token to fuel your crew costs and endless triggers.