Obeka, Brute Chronologist, Magar of the Magic Strings, and Final Fortune

Prerequisites

• Obeka, Brute Chronologist on the battlefield
• Magar of the Magic Strings on the battlefield
• Final Fortune in hand
• An opponent is unable to block and kill creatures you control
• available

Steps

1. Cast Final Fortune by paying , causing you to take an extra turn after this one
2. Activate Magar by paying , noting Final Fortune 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 Final Fortune without paying its mana cost
6. Resolve the copy of Final Fortune, causing you to take an extra turn after this one
7. At the beginning of your end step, Final Fortune triggers
8. Holding priority, activate Obeka by tapping it, ending the turn
9. Repeat from step 3

Results

• Infinite turns