At the beginning of your combat phase, Mishra triggers, targeting any artifact.
Holding priority, activate Lithoform Engine's first ability by paying ({2} magic symbol) and tapping it, copying Mishra's ability, targeting Lithoform Engine.
Resolve the copy of Mishra's ability, creating a token copy of Lithoform Engine that is a 4/4 creature with haste named Mishra's Warform in addition to its other types.
Activate Mishra's Warform's first ability by paying ({2} magic symbol) , and tapping it, copying Mishra's ability, targeting Lithoform Engine.