Yenna, Redtooth Regent, Second Wind, and Leyline of Singularity

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Second Wind on the battlefield
• Leyline of Singularity on the battlefield

Steps

1. Activate the mana-producing creature by tapping it, adding at least
2. Activate Yenna by paying and tapping it, creating a token copy of Second Wind attached to the mana-producing creature, then untapping Yenna and causing you to scry 2
3. Put the oldest Second Wind into your graveyard due to the legend rule
4. Activate the Second Wind token's second ability by tapping it, untapping the mana-producing creature
5. Repeat

Results

• Infinite scry 2