Breya, Etherium Shaper, Master Transmuter, Phyrexian Altar, and Intruder Alarm

Prerequisites

• Breya, Etherium Shaper on the battlefield
• Master Transmuter on the battlefield
• Phyrexian Altar on the battlefield
• Intruder Alarm on the battlefield
• Master Transmuter does not have summoning sickness
• available

Steps

1. Activate Master Transmuter by paying , tapping it and returning Breya from the battlefield to your hand, putting Breya onto the battlefield from your hand
2. Breya enters the battlefield, triggering itself and Intruder Alarm
3. Resolve the Breya trigger, creating two 1/1 Thopter artifact creature tokens
4. The Thopters enter the battlefield, triggering Intruder Alarm twice
5. Resolve all Intruder Alarm triggers, untapping all creatures
6. Activate Phyrexian Altar by sacrificing a Thopter, adding
7. Repeat
8. Once you have infinite creature tokens and infinite colored mana, you may activate Breya's ability infinite times

Results

• Infinite colored mana
• Infinite creature tokens
• Infinite damage
• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite LTB
• Infinite sacrifice triggers
• Reduce any number of target creatures' toughness to zero