Otherworldly Escort, Amoeboid Changeling, Intruder Alarm, and Blasting Station

Prerequisites

• Otherworldly Escort on the battlefield
• Amoeboid Changeling on the battlefield
• Intruder Alarm on the battlefield
• Blasting Station on the battlefield

Steps

1. Activate Amoeboid Changeling's second ability by tapping it, causing Otherworldly Escort to lose all creature types until end of turn
2. Activate Blasting Station by tapping it and sacrificing Otherworldly Escort
3. When Otherworldly Escort dies, it triggers, returning itself from your graveyard to the battlefield as a Spirit Detective
4. When Otherworldly Escort enters, Intruder Alarm and Blasting Station trigger, untapping all creatures and Blasting Station
5. Resolve the Blasting Station ability from step 2
6. Repeat

Results

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