Cast Necromantic Selection by paying {4}{B}{B}{B}.
Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
When Dualcaster Mage enters the battlefield, it triggers, copying Necromantic Selection.
Resolve the copy of Necromantic Selection, destroying all creatures and returning Dualcaster Mage from your graveyard to the battlefield.
Repeat from step 3.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite magecraft triggers

Dualcaster Mage

Necromantic Selection

Cast Necromantic Selection by paying {4}{B}{B}{B}.
Holding priority, cast Naru Meha by paying {2}{U}{U}.
When Naru Meha enters the battlefield, it triggers, copying Necromantic Selection.
Resolve the copy of Necromantic Selection, destroying all creatures and returning Naru Meha from your graveyard to the battlefield.
Repeat from step 3.

Combos with "Necromantic Selection"