Activate Altar of Dementia by sacrificing Dockside Extortionist, targeting any player.
Ashnod the Uncaring triggers, copying Altar of Dementia's ability, targeting any player.
Resolve both Altar of Dementia abilities, causing target player to mill cards equal to Dockside Extortionist's power twice.
Activate Bonecaller Cleric by paying 3 and sacrificing it, targeting Dockside Extortionist.
Ashnod the Uncaring triggers, copying Bonecaller Cleric's ability, with the copy targeting Bonecaller Cleric.
Resolve both Bonecaller Cleric abilities, returning it and Dockside Extortionist to the battlefield from your graveyard.
When Dockside Extortionist enters the battlefield, it triggers, creating at least three Treasure artifact tokens.
Activate three Treasures by tapping and sacrificing them, adding 3.
Repeat.
If opponents control four or more artifacts and/or enchantments, this combo nets infinite Treasure tokens.
This brilliant loop is built around the relentless synergy of Ashnod the Uncaring, whose commander-focused static ability doubles every sacrifice-fueled activated ability you control. You initiate the sequence by feeding Dockside Extortionist to Altar of Dementia, letting Ashnod the Uncaring duplicate the mill trigger to strip away your opponents' libraries twice as fast. Meanwhile, Bonecaller Cleric steps in to salvage your fallen threats, using Ashnod the Uncaring to simultaneously recur both itself and Dockside Extortionist from the graveyard back to the battlefield. As long as Dockside Extortionist generates enough Treasure tokens upon re-entering to fund Bonecaller Cleric's activation cost, this self-sustaining engine spins infinitely to mill out the table and bury your opponents in endless riches.