Otherworldly Escort + Amoeboid Changeling + Intruder Alarm + Woe Strider

Otherworldly Escort

Amoeboid Changeling

Intruder Alarm

Woe Strider

How it works

1. Activate Amoeboid Changeling's second ability by tapping it, causing Otherworldly Escort to lose all creature types until end of turn.
2. Activate Woe Strider 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 Woe Strider ability.
6. Repeat.

This clever loop relies on stripping away creature types so that Otherworldly Escort completely bypasses its own restriction against returning as a Spirit when it dies. By tapping Amoeboid Changeling to make Otherworldly Escort lose all creature types, you ensure that when you feed it to Woe Strider's sacrifice outlet, its post-death resurrection clause safely triggers. Because Intruder Alarm stands ready to untap your entire board every time that a creature enters the battlefield, sacrificing and recurring Otherworldly Escort endlessly untaps Amoeboid Changeling, Woe Strider, and any mana producers you happen to control, fueling an infinite cascade of deaths, sacrifices, and scry triggers.