Tawnos, Solemn Survivor, Intruder Alarm, and Priest of Urabrask

Prerequisites

• Tawnos, Solemn Survivor on the battlefield
• Intruder Alarm on the battlefield
• Priest of Urabrask in the graveyard
• Tawnos does not have summoning sickness
• You control at least two artifact tokens
• available

Steps

1. Activate Tawnos' second ability by paying , sacrificing two artifact tokens, and exiling Priest of Urabrask from your graveyard, creating a token copy of Priest of Urabrask that is an artifact in addition to its other types
2. The Priest of Urabrask token enters the battlefield, triggering itself and Intruder Alarm
3. Resolve the Priest of Urabrask trigger, adding
4. Resolve the Intruder Alarm trigger, untapping all creatures
5. Activate Tawnos' first ability by paying and tapping it, creating a token copy of the Priest of Urabrask token, and causing you to mill two cards
6. Repeat from step 2
7. Once you have infinite red mana, you may instead choose any other artifact token(s) to make infinite copies of them

Results

• Infinite copies of artifact tokens you control
• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite red mana
• Infinite self-mill
• Infinite untap of all creatures