Splinter Twin, and Deceiver Exarch

Prerequisites

• Splinter Twin on the battlefield
• Deceiver Exarch on the battlefield
• Splinter Twin is attached to Deceiver Exarch
• Deceiver Exarch does not have summoning sickness

Steps

1. Activate Deceiver Exarch by tapping it, creating a token copy of itself with haste
2. The token Deceiver Exarch enters the battlefield, untapping the nontoken Deceiver Exarch
3. Repeat

Results

• Infinite creatures tokens with haste
• Infinite ETB