Amoeboid Changeling + Bloodflow Connoisseur + Intruder Alarm + Otherworldly Escort

WUB identity

Commander legal

The 4 combo pieces

• Amoeboid Changeling
• Bloodflow Connoisseur
• Intruder Alarm
• Otherworldly Escort

How to execute it

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

What the combo produces

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