Dualcaster Mage, and Doppelgang

Prerequisites

• Dualcaster Mage in hand
• Doppelgang in hand
• There is at least one permanent on the battlefield
• available

Steps

1. Cast Doppelgang by paying at least , targeting any permanent(s)
2. Holding priority, cast Dualcaster Mage by paying
3. When Dualcaster Mage enters the battlefield, it triggers, copying Doppelgang, creating a token copy of Dualcaster Mage and any other permanent(s)
4. When the token Dualcaster Mage enters the battlefield, it triggers, copying Doppelgang, creating a token copy of Dualcaster Mage and any other permanent(s)
5. Repeat step 4
6. If desired, you may pay an additional when casting Doppelgang to get an additional target, which can be used on any permanent on the battlefield to get infinite copies of it

Results

• Infinite copies of permanents on the battlefield
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite landfall triggers
• Infinite LTB
• Infinite magecraft triggers
• Infinite mana lands that enter the battlefield untapped can produce