Activate Galvanic Juggernaut by tapping it, creating a copy of the creature token.
Activate Altar of Dementia by sacrificing a creature token.
When the creature token dies, Galvanic Juggernaut triggers, untapping itself.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
Repeat from step 2.
This loop turns your existing creature tokens into an engine of endless sacrifice by leveraging Ghired, Mirror of the Wilds to continually stamp out fresh copies the moment they enter. Galvanic Juggernaut provides the tapping mechanism to fuel Ghired's ability, and its crucial passive trait—un-tapping whenever another creature dies—ensures it is always ready to repeat the process. Finally, Altar of Dementia acts as the grim outlet that sacrifices those freshly minted tokens, milling your opponents while sending the creature to the graveyard to immediately wake up Galvanic Juggernaut for another cycle.