How can you create a combo with Elvish Piper, Great Oak Guardian, Vedalken Mastermind?
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[START OF COMBO]This combo can be formed with Elvish Piper, Great Oak Guardian, Vedalken Mastermind

Color identity: GU
Mana cost: 
Steps:
  1. Activate all mana-producing creatures you control by tapping them, adding at least {G}{U}.
  2. Activate Elvish Piper by paying {G} and tapping it, putting Great Oak Guardian from your hand onto the battlefield.
  3. Great Oak Guardian enters the battlefield, untapping all creatures you control and giving them +2/+2 until end of turn.
  4. Activate Vedalken Mastermind by paying {U} and tapping it, returning Great Oak Guardian from the battlefield to your hand.
  5. Repeat.
  6. If you can produce at least one additional mana in step 1, this combo produces infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large creatures until end of turn
  - Infinite mana creatures you control can produce
  - Infinite untap of creatures you control
  - Infinitely large creatures you control until end of turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Elvish Piper must be on the battlefield
  - Great Oak Guardian must be in your hand
  - Vedalken Mastermind must be on the battlefield
  - Creatures you control can tap to produce at least {G}{U}.
  - Vedalkan Mastermind and Elvish Piper do not have summoning sickness.
[END OF COMBO PREREQUISITES]
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