Xavier Sal, Infested Captain, Basking Broodscale, and Intruder Alarm

Prerequisites

• Xavier Sal, Infested Captain on the battlefield
• Basking Broodscale on the battlefield
• Intruder Alarm on the battlefield
• You control at least one additional creature
• Xavier Sal does not have summoning sickness
• Basking Broodscale has at least one +1/+1 counter on it

Steps

1. Activate Xavier Sal's second ability by tapping it and sacrificing any other creature you control, putting a +1/+1 counter on Basking Broodscale Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token
2. When the Eldrazi Spawn enters the battlefield, Intruder Alarm triggers, untapping all creatures
3. Repeat
4. Once you have infinite +1/+1 counters on Basking Broodscale, you may instead use Xavier Sal's first ability to get infinite copies of creature tokens you control

Results

• Infinite +1/+1 counters on Basking Broodscale
• Infinite colorless mana
• Infinite copies of creature tokens you control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite proliferate
• Infinite sacrifice triggers
• Infinite untap of all creatures