Dualcaster Mage, Sygg's Command, and Rukarumel, Biologist

Prerequisites

• Dualcaster Mage in hand
• Sygg's Command in hand
• Rukarumel, Biologist on the battlefield
• available

Steps

1. Cast Sygg's Command 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 Sygg's Command, targeting Dualcaster Mage
4. Resolve the copy of Sygg's Command, creating a token copy of Dualcaster Mage
5. Repeat from step 3

Results

• Infinite creature ETB
• Infinite card draw for any number of players
• Infinite creature tokens
• Infinite draw triggers for any number of players
• Infinite magecraft triggers