Descent into Avernus + Clock of Omens + Lithoform Engine + Blessed Sanctuary

Descent into Avernus

Clock of Omens

Lithoform Engine

Blessed Sanctuary

How it works

1. At the beginning of your upkeep, Descent into Avernus triggers.
2. Holding priority, activate Lithoform Engine's first ability by paying 2 and tapping it, copying Descent into Avernus' ability.
3. 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.
4. Activate Clock of Omens by tapping two Treasures, untapping Lithoform Engine.
5. Activate two Treasures by tapping and sacrificing them, adding 2.
6. Repeat from step 2.