Splinter Twin, and Corridor Monitor

Prerequisites

• Splinter Twin on the battlefield
• Corridor Monitor on the battlefield
• undefined

Steps

1. Activate Corridor Monitor by tapping it, creating a token copy of itself with haste
2. When the token Corridor Monitor enters the battlefield, it triggers, untapping the nontoken Corridor Monitor
3. Repeat

Results

• Infinite ETB
• Infinite creature tokens with haste