Dualcaster Mage, and Heat Shimmer

Prerequisites

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

Steps

1. Cast Heat Shimmer 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 Heat Shimmer, targeting Dualcaster Mage
4. Resolve the copy of Heat Shimmer, creating a token copy of Dualcaster Mage with haste
5. Repeat from step 3

Results

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