Doubling Season, Tamiyo, the Moon Sage, and Lotus Petal

Prerequisites

• Doubling Season on the battlefield
• Tamiyo, the Moon Sage in hand
• Lotus Petal 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 Lotus Petal by paying
5. Activate Lotus Petal by tapping and sacrificing it, adding one mana of any color
6. Tamiyo's emblem triggers, returning Lotus Petal from your graveyard to your hand
7. Repeat from step 3

Results

• Infinite colored mana
• Infinite storm count