How can you create a combo with Tainted Observer, Mana Echoes, Scurry Oak?
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[START OF COMBO]This combo can be formed with Tainted Observer, Mana Echoes, Scurry Oak

Color identity: GUR
Mana cost: {1}
Steps:
  1. Cause a creature to enter the battlefield under your control.
  2. When the creature enters the battlefield, Tainted Observer and Mana Echoes triggers.
  3. Resolve the Mana Echoes trigger, adding {C} for each creature that shares a creature type with the creature that entered the battlefield.
  4. Resolve the Tainted Observer trigger, causing you to pay {2} to put a +1/+1 counter on Scurry Oak.
  5. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Scurry Oak
  - 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 have a way to cause a creature to enter the battlefield under your control.
  - Scurry Oak has at least one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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