Descent into Avernus, Clock of Omens, Lithoform Engine, and Seht's Tiger

Prerequisites

• Descent into Avernus on the battlefield
• Clock of Omens on the battlefield
• Lithoform Engine on the battlefield
• Seht's Tiger in hand
• Descent into Avernus has at least two descent counters on it
• available

Steps

1. At the beginning of your upkeep, Descent into Avernus triggers
2. Holding priority, cast Seht's Tiger by paying
3. When Seht's Tiger enters the battlefield, it triggers, giving you protection from red until end of turn
4. Activate Lithoform Engine's first ability by paying and tapping it, copying Descent into Avernus' ability
5. Resolve the copy of Descent into Avernus' ability, putting two descent counters on it, then causing each player to create a number of Treasure tokens equal to the number of descent counters on it, and then deal that much damage to each opponent
6. Activate Clock of Omens by tapping two Treasures, untapping Lithoform Engine
7. Activate two Treasures by tapping and sacrificing them, adding
8. Repeat from step 4

Results

• Infinite colored mana for all players
• Infinite damage
• Infinite descent counters on Descent into Avernus
• Infinite Treasure tokens for all players