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 Tracker triggers twice due to Fractured Realm, creating two artifact tokens.
Activate Clock of Omens by tapping the artifact tokens, untapping Hearthhull.
Repeat.
This clever engine transforms Hearthhull, the Worldseed into a lethal drain machine by recycling your land drops directly from the graveyard using Crucible of Worlds. As those lands enter the battlefield, Tireless Tracker triggers to flood your board with Clue tokens, a process supercharged by the doubling power of Fractured Realm's second room. You can then tap those newly minted artifacts to Clock of Omens, untapping Hearthhull so you can sacrifice another land to repeat the loop. Meanwhile, Mirror Room provides the initial token-copy utility, keeping your engine churning infinitely until your opponents' life totals are whittled down to zero.