Yomiji, Who Bars the Way, Mox Amber, and Sarcatog

Prerequisites

• Yomiji, Who Bars the Way on the battlefield
• Mox Amber on the battlefield
• Sarcatog on the battlefield

Steps

1. Activate Sarcatog's second ability by sacrificing Mox Amber
2. Yomiji triggers, returning Mox Amber from your graveyard to your hand
3. Resolve the Sarcatog ability, giving it +1/+1 until end of turn
4. Cast Mox Amber by paying
5. Activate Mox Amber by tapping it, adding one mana of any color among legendary creatures or planeswalkers you control
6. Repeat

Results

• Infinite storm count
• Infinite mana among colors of legendary creatures and planeswalkers you control
• Infinitely large Sarcatog until end of turn