Otherworldly Escort, Amoeboid Changeling, Intruder Alarm, and Evereth, Viceroy of Plunder

Prerequisites

• Otherworldly Escort on the battlefield
• Amoeboid Changeling on the battlefield
• Intruder Alarm on the battlefield
• Evereth, Viceroy of Plunder 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 Evereth by 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 triggers, untapping all creatures
5. Resolve the Evereth ability
6. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures
• Infinite damage