Valkyrie's Call + Simulacrum Synthesizer + Ashnod's Altar + Vehicle with MV >= 3 and a Crew Ability

Decks

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How it works

You have enough mana to cast the Vehicle with MV >= 3.
The number of artifacts you control is equal to or greater than the Vehicle's crew number minus 2.
Vehicle with MV >= 3 and a Crew Ability

Cast the Vehicle by paying its mana cost.
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.
Activate the Vehicle's crew ability by tapping the Construct, causing the Vehicle to become an artifact creature until end of turn.
Activate Ashnod's Altar by sacrificing the Vehicle.
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.
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.
Repeat from step 3.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.