Berta, Wise Extrapolator, Intruder Alarm, and Xavier Sal, Infested Captain

Prerequisites

• Berta, Wise Extrapolator on the battlefield
• Intruder Alarm on the battlefield
• Xavier Sal, Infested Captain on the battlefield
• available

Steps

1. Activate Berta by paying and tapping it, creating a 0/0 Fractal creature token and putting a +1/+1 counter on it
2. When the Fractal enters, Intruder Alarm triggers, untapping all creatures
3. Activate Xavier Sal's second ability by tapping it and sacrificing the Fractal, causing you to proliferate and put a +1/+1 counter on Berta
4. Berta triggers, adding
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite proliferate
• Infinite sacrifice triggers
• Infinite untap of creatures
• Infinite untap of creatures you control