Magar of the Magic Strings, Last Chance, and Sundial of the Infinite

Prerequisites

• Magar of the Magic Strings on the battlefield
• Last Chance in hand
• Sundial of the Infinite on the battlefield
• An opponent is unable to block and kill creatures you control
• available each extra turn
• available

Steps

1. Cast Last Chance by paying , causing you to take an extra turn after this one
2. Activate Magar by paying , noting Last Chance and putting it face down as a 3/3 creature
3. Move to your next turn
4. Deal combat damage to an opponent with the face down creature
5. The face down creature triggers, causing you to cast a copy of Last Chance without paying its mana cost
6. Resolve the copy of Last Chance, causing you to take an extra turn after this one
7. At the beginning of your end step, Last Chance triggers
8. Holding priority, activate Sundial of the Infinite by paying and tapping it, ending the turn
9. Repeat from step 3

Results

• Infinite turns