Priest of Urabrask, Feldon of the Third Path, and Intruder Alarm

Prerequisites

• Priest of Urabrask in the graveyard
• Feldon of the Third Path on the battlefield
• Intruder Alarm on the battlefield
• Feldon does not have summoning sickness
• available

Steps

1. Activate Feldon by tapping it and paying , creating an artifact token copy of Priest of Urabrask with haste
2. The token copy of Priest of Urabrask and Intruder Alarm trigger
3. Resolve the Priest of Urabrask trigger, adding
4. Resolve the Intruder Alarm trigger, untapping all creatures
5. Repeat

Results

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