How can you create a combo with Obeka, Brute Chronologist, Magar of the Magic Strings, Last Chance?
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[START OF COMBO]This combo can be formed with Obeka, Brute Chronologist, Magar of the Magic Strings, Last Chance

Color identity: UBR
Mana cost: {1}{B}{R}{R}{R}
Steps:
  1. Cast Last Chance by paying {R}{R}, causing you to take an extra turn after this one.
  2. Activate Magar by paying {1}{B}{R}, 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 Obeka by tapping it, ending the turn.
  9. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite turns[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Obeka, Brute Chronologist must be on the battlefield
  - Magar of the Magic Strings must be on the battlefield
  - Last Chance must be in your hand
  - An opponent is unable to block and kill creatures you control.
[END OF COMBO PREREQUISITES]
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