Valkyrie's Call + Simulacrum Synthesizer + Altar of Dementia

Valkyrie's Call

Simulacrum Synthesizer

Altar of Dementia

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 Altar of Dementia 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. Resolve the Altar of Dementia ability.
8. Repeat from step 3.

This clever loop uses Valkyrie's Call to continuously resurrect a sacrificed Vehicle, fueling an infinite engine of death and rebirth. Each time the Vehicle drops back onto the battlefield, Simulacrum Synthesizer triggers to churn out an ever-growing army of Construct artifact creature tokens. You then tap one of those freshly minted tokens to crew the Vehicle, setting it up to be immediately fed to Altar of Dementia to mill your opponent out of the game. Because Valkyrie's Call bypasses the graveyard every time the Vehicle bites the dust, this mechanical cycle can repeat indefinitely to bury your foes under an avalanche of triggers.