Necromantic Selection, and Dualcaster Mage

Prerequisites

• Necromantic Selection in hand
• Dualcaster Mage in hand
• available

Steps

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

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers