How can you create a combo with Slagstone Refinery, March of the Machines, Sword of the Meek, Ashnod's Altar, Chief of the Foundry?
user
[START OF COMBO]This combo can be formed with Slagstone Refinery, March of the Machines, Sword of the Meek, Ashnod's Altar, Chief of the Foundry

Color identity: U
Mana cost: 
Steps:
  1. Activate Ashnod's Altar by sacrificing Sword of the Meek, adding {C}{C}.
  2. Sword of the Meek dies, triggering Slagstone Refinery, creating a tapped Powerstone token that enters the battlefield as a 1/1 creature due to March of the Machines and Chief of the Foundry.
  3. Sword of the Meek triggers, returning itself from your graveyard to the battlefield, but not attaching itself to the Powerstone due to Sword of the Meek becoming a creature.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite tapped creature tokens
  - Infinite tapped Powerstone tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant