Dualcaster Mage + Echo Storm + Encroaching Mycosynth

Prerequisites

• You've cast your commander from the command zone at least once this game.

Steps

1. 1Cast Echo Storm by paying , targeting Dualcaster Mage.
2. 2Echo Storm triggers, creating a copy of itself, targeting Dualcaster Mage.
3. 3Resolve the copy of Echo Storm, creating a token copy of Dualcaster Mage.
4. 4When the Dualcaster Mage token enters the battlefield, it triggers, creating a copy of Echo Storm, targeting Dualcaster Mage.
5. 5Repeat from step 3.

Effects

• Infinite creature ETB
• Infinite creature tokens
• Infinite magecraft triggers