Activate Hearthhull by paying 1, tapping it and sacrificing a land.
If Hearthhull has eight or more charge counters on it, it triggers, causing each opponent to lose 2 life.
Resolve the Hearthhull ability, causing you to draw two cards and allowing you to play an additional land this turn.
Play the land from your graveyard.
When the land enters the battlefield, Tireless Provisioner triggers twice due to Elesh Norn, creating two artifact tokens.
Activate Clock of Omens by tapping the artifact tokens, untapping Hearthhull.
Repeat.
This elaborate loop starts by using Hearthhull, the Worldseed to sacrifice a land for card draw and extra land drops, draining your opponents along the way. Walk-In Closet // Forgotten Cellar then lets you continuously replay that sacrificed land from your graveyard, while Tireless Provisioner generates a steady stream of artifact tokens on each entrance. Elesh Norn, Mother of Machines doubles those landfall triggers to ensure you always have enough artifacts to feed into Clock of Omens, which untaps Hearthhull to keep the engine running indefinitely.