Doubling Season, Tamiyo, the Moon Sage, and Dark Sphere

Prerequisites

• Doubling Season on the battlefield
• Tamiyo, the Moon Sage in hand
• Dark Sphere on the battlefield
• available

Steps

1. Cast Tamiyo by paying
2. Tamiyo enters the battlefield with eight loyalty counters on it due to Doubling Season
3. Activate Tamiyo's third loyalty ability by removing eight loyalty counters from it, causing you to get its emblem
4. Cast Dark Sphere by paying
5. Activate Dark Sphere by tapping and sacrificing it
6. Tamiyo's emblem triggers, returning Dark Sphere from your graveyard to your hand
7. Repeat from step 3

Results

• Infinite storm count