Muldrotha, the Gravetide, Izzet Chemister, and Time Stretch

Prerequisites

• Muldrotha, the Gravetide on the battlefield
• Izzet Chemister on the battlefield
• Time Stretch in hand
• undefined available the first turn, with each extra turn available

Steps

1. Cast Time Stretch by paying , causing you to take two extra turns after this one
2. Activate Izzet Chemister's first ability by paying and tapping it, exiling Time Stretch from your graveyard
3. Move to your second extra turn
4. Activate Izzet Chemister's second ability by paying , tapping and sacrificing it, casting Time Stretch from exile without paying its mana cost
5. Resolve Time Stretch, causing you to take two extra turns after this one
6. Cast Izzet Chemister from your graveyard by paying
7. Repeat from step 2

Results

• Infinite turns