Invasion of Alara triggers, causing you to exile it and cast it transformed as Awaken the Maelstrom.
Holding priority, cast Naru Meha by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) .
When Naru Meha enters the battlefield, it triggers, copying Awaken the Maelstrom.
Resolve the copy of Awaken the Maelstrom, causing target player to draw two cards, then allowing you to put an artifact card from your hand onto the battlefield, then creating a token copy of Naru Meha, then distributing three +1/+1 counters among one to three creatures you control, then destroying target permanent an opponent controls.
Put either Naru Meha into your graveyard due to the legend rule.
Repeat from step 4.
Results
Destroy all permanents opponents control.
Infinite +1/+1 counters.
Infinite card draw for any number of players.
Infinite death triggers.
Infinite draw triggers for any number of players.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Put all artifact cards from your hand and library onto the battlefield.