Kolodin, Triumph Caster + Salvaging Station + Extruder + The Last Ride

Kolodin, Triumph Caster

Salvaging Station

Extruder

The Last Ride

How it works

1. Activate Salvaging Station by tapping it, returning The Last Ride from your graveyard to the battlefield.
2. When The Last Ride enters, Kolodin triggers, causing The Last Ride to become an artifact creature until end of turn.
3. Activate Extruder by sacrificing The Last Ride.
4. When The Last Ride dies, Salvaging Station triggers, untapping Salvaging Station.
5. Resolve the Extruder ability.
6. Repeat.

This loop relies on Salvaging Station as your engine, continually pulling The Last Ride back from the graveyard for the low cost of a tap. Every time The Last Ride enters the battlefield, Kolodin, Triumph Caster's static ability immediately turns it into an artifact creature without needing to worry about crewing. You can then feed that newly minted artifact creature straight to Extruder's sacrifice ability to pump up your board with infinite +1/+1 counters. Best of all, whenever The Last Ride dies, Salvaging Station's triggered ability untaps itself so you can start the whole cycle right back up again.