Vedalken Mastermind, Intruder Alarm, Dual Nature, Phyrexian Altar, and Crimson Kobolds

Prerequisites

• Vedalken Mastermind on the battlefield
• Intruder Alarm on the battlefield
• Dual Nature on the battlefield
• Phyrexian Altar on the battlefield
• Crimson Kobolds in hand
• Vedalken Mastermind does not have summoning sickness

Steps

1. Cast Crimson Kobolds by paying
2. When Crimson Kobolds enters the battlefield, Intruder Alarm and Dual Nature's first ability triggers
3. Resolve the Intruder Alarm trigger, untapping all creatures
4. Resolve the Dual Nature trigger, creating a token copy of Crimson Kobolds
5. Activate Phyrexian Altar by sacrificing the Crimson Kobolds token, adding
6. Activate Vedalken Mastermind by paying and tapping it, returning Crimson Kobolds to your hand from the battlefield
7. Dual Nature's second ability triggers, exiling nothing
8. Repeat

Results

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