Rat King, Verminister + Intruder Alarm + Belonging + Yahenni, Undying Partisan

Prerequisites

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Steps

1. 1Cast Belonging by paying .
2. 2When Belonging enters, it and Intruder Alarm trigger.
3. 3Resolve the Belonging trigger, creating three 1/1 Shapeshifter creature tokens with changeling.
4. 4When the Shapeshifters enter, Intruder Alarm triggers three times. Resolve the Intruder Alarm triggers from this step and step 2, untapping all creatures four times.
5. 5Activate Yahenni by sacrificing Belonging.
6. 6Activate Rat King by tapping it and sacrificing the Shapeshifters, returning Belonging from your graveyard to the battlefield.
7. 7Repeat from step 2.

Effects

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