Dualcaster Mage + Green Sun's Twilight + Infinite Reflection + Living Plane

Dualcaster Mage

Green Sun's Twilight

Infinite Reflection

Living Plane

How it works

1. Cast Green Sun's Twilight with X equal to 5 or more by paying at least 5.
2. In response, cast a creature spell with flash by paying its mana cost.
3. The creature enters the battlefield as a copy of Dualcaster Mage, triggering its ETB effect, copying Green Sun's Twilight.
4. Resolve that copy, revealing at least the top six cards of your library and putting a creature and/or land card from among them onto the battlefield, then putting the rest on the bottom.
5. Each creature or land chosen this way enters the battlefield as a copy of Dualcaster Mage.
6. Repeat from step 3.