Holding priority, activate Lithoform Engine's first ability by paying ({2} magic symbol) and tapping it, copying Ulalek's trigger.
Resolve the copy of Ulalek's trigger, causing you to pay ({C} magic symbol) ({C} magic symbol) to copy the Spawn-Gang Commander spell, Ulalek's trigger and Spawn-Gang Commander's trigger.
Resolve the copy of the Spawn-Gang Commander spell.
Resolve the copy of Spawn-Gang Commander's trigger, creating three 0/1 Eldrazi Spawn creature tokens.
Activate two Eldrazi Spawn creature tokens by sacrificing them, adding ({C} magic symbol) ({C} magic symbol) .
Resolve the copy of Ulalek's trigger from step 4, causing you to pay ({C} magic symbol) ({C} magic symbol) to copy the Spawn-Gang Commander spell, Ulalek's trigger and Spawn-Gang Commander's trigger.
Repeat from step 5.
Once you have infinite ({C} magic symbol) and Eldrazi Spawn tokens, you may sacrifice them to Spawn-Gang Commander to deal infinite damage to any target(s).
Results
Infinite colorless mana.
Infinite copies of abilities you control on the stack.