Dualcaster Mage, and Electroduplicate

Prerequisites

• Dualcaster Mage on the battlefield
• Electroduplicate in hand
• You control at least one creature
• You have enough mana to cast Electroduplicate available

Steps

1. Cast Electroduplicate by paying its mana cost, targeting a creature you control
2. Holding priority, cast Dualcaster Mage by paying
3. When Dualcaster Mage enters the battlefield, it triggers, copying Electroduplicate, targeting Dualcaster Mage
4. Resolve the copy of Electroduplicate, creating a token copy of Dualcaster Mage with haste
5. Repeat from step 3

Results

• Infinite ETB
• Infinite magecraft triggers
• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite creature tokens with haste