Otherworldly Escort + Amoeboid Changeling + Intruder Alarm + Umbral Collar Zealot

Prerequisites

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Steps

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

Effects

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