Felhide Spiritbinder, Intruder Alarm, Priest of Urabrask, and Viridian Longbow

Prerequisites

• Felhide Spiritbinder on the battlefield
• Intruder Alarm on the battlefield
• Priest of Urabrask in hand
• Viridian Longbow on the battlefield
• Viridian Longbow attached to Felhide Spiritbinder
• Felhide Spiritbinder does not have summoning sickness
• available

Steps

1. Activate Felhide Spiritbinder by tapping it, dealing 1 damage to any target
2. Cast Priest of Urabrask by paying
3. Priest of Urabrask enters the battlefield, triggering itself and Intruder Alarm
4. Resolve the Priest of Urabrask trigger, adding
5. Resolve the Intruder Alarm trigger, untapping all creatures
6. Felhide Spiritbinder triggers, holding priority, activate it by tapping it, dealing 1 damage to any target
7. Resolve the Felhide Spiritbinder trigger, causing you to pay to create a token copy of Priest of Urabrask with haste
8. Repeat from step 3

Results

• Infinite creature tokens
• Infinite damage
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite red mana
• Infinite untap of all creatures