Intruder Alarm, Lena, Selfless Champion, and Whisper, Blood Liturgist

Prerequisites

• Intruder Alarm on the battlefield
• Lena, Selfless Champion on the battlefield
• Whisper, Blood Liturgist on the battlefield
• You control at least three additional creatures, one of which must be nontoken
• Whisper does not have summoning sickness

Steps

1. Activate Lena by sacrificing it, causing creatures you control with power less than Lena's power to gain indestructible until end of turn
2. Activate Whisper by tapping it and sacrificing two other creatures, returning Lena from your graveyard to the battlefield
3. Lena enters the battlefield, triggering itself and Intruder Alarm
4. Resolve the Lena trigger, creating at least three 1/1 Soldier creature tokens
5. Resolve the Intruder Alarm trigger, untapping all creatures
6. Repeat

Results

• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite untap of all creatures