Clown Car + Salvaging Station + Battered Golem + Goblin Bombardment

Clown Car

Salvaging Station

Battered Golem

Goblin Bombardment

How it works

1. Activate Salvaging Station by tapping it, returning Clown Car from your graveyard to the battlefield.
2. When Clown Car enters the battlefield, Battered Golem triggers, untapping Battered Golem.
3. Activate Clown Car's crew ability by tapping Battered Golem, causing Clown Car to become an artifact creature until end of turn.
4. Activate Goblin Bombardment by sacrificing Clown Car.
5. When Clown Car dies, Salvaging Station triggers, untapping Salvaging Station.
6. Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
7. Repeat.

This ingenious loop turns Clown Car into a self-recycling projectile by exploiting the mechanical interplay between your graveyard and the battlefield. When Clown Car enters for $X=0$, its zero mana value makes it a legal target to be yanked straight out of your graveyard by the tapped ability of Salvaging Station. That entry immediately triggers Battered Golem, whose passive ability untaps the Golem so it can immediately crew Clown Car, turning it into an artifact creature. From there, Goblin Bombardment steps in to sacrifice the freshly crewed Clown Car for damage, which in turn triggers Salvaging Station to untap itself and start the cycle all over again.