How can you create a combo with Bjorna, Nightfall Alchemist, Othelm, Sigardian Outcast, Intruder Alarm, Su-Chi?
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[START OF COMBO]This combo can be formed with Bjorna, Nightfall Alchemist, Othelm, Sigardian Outcast, Intruder Alarm, Su-Chi

Color identity: RGWU
Mana cost: 
Steps:
  1. Activate Bjorna by tapping it and sacrificing Su-Chi, targeting any creature.
  2. Su-Chi dies, adding {C}{C}{C}{C}.
  3. Activate Othelm by paying {2} and tapping it, returning Su-Chi from your graveyard to the battlefield.
  4. Su-Chi enters the battlefield, triggering Intruder Alarm, untapping all creatures.
  5. Repeat an arbitrarily large number of times.
  6. Resolve all Bjorna abilities, dealing infinite damage to any creature(s).[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite damage to creatures
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana creatures you control can produce
  - Infinite sacrifice triggers
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Bjorna and Othelm do not have summoning sickness.
[END OF COMBO PREREQUISITES]
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