Vedalken Mastermind, and Intruder Alarm

Prerequisites

• Vedalken Mastermind on the battlefield
• Intruder Alarm on the battlefield

Steps

1. Activate any number of creatures by tapping them, adding at least plus enough mana to cast the creature card in your hand
2. Cast the creature card by paying its mana cost
3. When the creature enters, Intruder Alarm triggers, untapping all creatures
4. Activate Vedalken Mastermind by paying and tapping it, returning the creature from the battlefield to your hand
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite storm count
• Infinite mana creatures you control can produce
• Infinite untap of creatures