({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) plus enough mana to pay for commander tax, if applicable available.
Steps
Cast Mirage Mockery by paying ({2} magic symbol) ({U} magic symbol) , targeting any nonartifact creature you control.
Holding priority, cast Naru Meha either from your hand or from the command zone by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) and commander tax, if applicable.
When Naru Meha enters the battlefield, it triggers, copying Mirage Mockery, with the copy targeting Naru Meha.
Resolve the Mirage Mockery copy, creating a token copy of Naru Meha.
Put the token Naru Meha into the graveyard due to the legend rule.
Repeat from step 3.
Optionally, you may initially cast Mirage Mockery with its entwine cost to get infinite copies of any artifact creature(s) you control with haste.
Results
Infinite copies of all artifact creatures you control with haste.