Elvish Piper, Great Oak Guardian, and Vedalken Mastermind

Prerequisites

• Elvish Piper on the battlefield
• Great Oak Guardian in hand
• Vedalken Mastermind on the battlefield
• Creatures you control can tap to produce at least
• Vedalkan Mastermind and Elvish Piper do not have summoning sickness

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least
2. Activate Elvish Piper by paying 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 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

Results

• Infinite ETB
• Infinite LTB
• 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