Otherworldly Escort + Amoeboid Changeling + Intruder Alarm + Ashnod's Altar

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 Ashnod's Altar 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. 5Repeat.

Effects

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