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 Roaming Throne, creating two artifact tokens.
Activate Clock of Omens by tapping the artifact tokens, untapping Hearthhull.
Repeat.
This brilliant engine transforms your land drops into a relentless loop of card draw and life drain by turning Hearthhull, the Worldseed into an active sacrifice outlet. Tireless Provisioner provides the raw material by spawning artifact tokens whenever a land enters, which are immediately put to work by Clock of Omens to untap Hearthhull so you can keep sacrificing lands. Roaming Throne doubles up Tireless Provisioner's landfall triggers to ensure you always have enough artifacts to feed the Clock, while Conduit of Worlds lets you seamlessly replay those sacrificed lands straight from your graveyard.