How can you create a combo with Golgari Thug, Dross Harvester, Bolas's Citadel, Ashnod's Altar?
user
[START OF COMBO]This combo can be formed with Golgari Thug, Dross Harvester, Bolas's Citadel, Ashnod's Altar

Color identity: B
Mana cost: 
Steps:
  1. Activate Ashnod's Altar by sacrificing Golgari Thug, adding {C}{C}.
  2. Golgari Thug dies, triggering itself and Dross Harvester.
  3. Resolve the Golgari Thug trigger, putting itself on top of your library from your graveyard.
  4. Resolve the Dross Harvester trigger, causing you to gain two life.
  5. Cast Golgari Thug from the top of your library by paying 2 life.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain triggers
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

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