All permanents on the battlefield (Machine God's Effigy as a copy of Dutiful Replicator).
Steps
At the beginning of your combat phase, Mishra triggers, creating a token copy of the Machine God's Effigy (which is a copy of Dutiful Replicator), except it is a 4/4 Construct artifact creature with haste named Mishra's Warform.
When Mishra's Warform enters the battlefield, its Dutiful Replicator ability triggers.
Holding priority, activate Mishra's Warform using the Machine God's Effigy ability by tapping it, adding ({U} magic symbol) .
Resolve the Mishra's Warform trigger from step 2, causing you to pay ({1} magic symbol) to create a token copy of Mishra's Warform.