Twinflame, Priest of Urabrask, Pinnacle Monk // Mystic Peak, and Expansion // Explosion

Prerequisites

• Twinflame in hand
• Priest of Urabrask on the battlefield
• Pinnacle Monk // Mystic Peak on the battlefield
• Expansion // Explosion in hand
• available

Steps

1. Cast Twinflame by paying , targeting any two creatures
2. Holding priority, cast Expansion by paying its mana cost, copying Twinflame, with the copy targeting Priest of Urabrask and Pinnacle Monk
3. Resolve the copy of Twinflame, creating a token copy of Priest of Urabrask and Pinnacle Monk with haste
4. When the Priest of Urabrask and Pinnacle Monk tokens enter, they trigger
5. Resolve the Priest of Urabrask trigger, adding
6. Resolve the Pinnacle Monk trigger, returning Expansion from your graveyard to your hand
7. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite storm count
• Infinite red mana
• Infinite creature tokens with haste
• Infinite magecraft triggers