Legion Extruder + Dross Scorpion + Mana Echoes
Legion Extruder
Dross Scorpion
Mana Echoes
Requires
Legion Extruder must be on the battlefield.
Dross Scorpion must be on the battlefield.
Mana Echoes must be on the battlefield.
You control at least one Golem, and at least one additional artifact creature.
Mana needed: 
Steps
- Activate Legion Extruder by paying , tapping it and sacrificing another artifact creature you control.
- When the artifact creature dies, Dross Scorpion triggers, untapping Legion Extruder.
- Resolve the Legion Extruder ability, creating a 3/3 Golem artifact creature token.
- When the Golem enters the battlefield, Mana Echoes triggers, adding at least .
- Repeat.
- If you control at least two Golems when the combo starts, this combo nets infinite colorless mana.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.
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