How can you create a combo with Sporoloth Ancient, Tainted Observer, Ashnod's Altar, Doubling Season?
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[START OF COMBO]This combo can be formed with Sporoloth Ancient, Tainted Observer, Ashnod's Altar, Doubling Season

Color identity: GU
Mana cost: 
Steps:
  1. Activate a creature you control by removing two spore counters from it, creating two 1/1 Saproling creature tokens.
  2. The Saprolings enter the battlefield, triggering Tainted Observer twice.
  3. Holding priority, activate Ashnod's Altar by sacrificing a Saproling, adding {C}{C}.
  4. Resolve the first Tainted Observer trigger, causing you to pay {2} to put two spore counters on any creature you control.
  5. Resolve the second Tainted Observer trigger, choosing not to pay.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You control a creature with at least three spore counters on it.
[END OF COMBO PREREQUISITES]
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