When Dualcaster Mage 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 Dualcaster Mage, then distributing three +1/+1 counters among one to three creatures you control, then destroying target permanent an opponent controls.
Repeat from step 4.
Results
Destroy all permanents opponents control.
Infinite +1/+1 counters.
Infinite card draw for any number of players.
Infinite creature tokens.
Infinite draw triggers for any number of players.
Infinite ETB.
Infinite magecraft triggers.
Put all artifact cards from your hand and library onto the battlefield.