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

Color identity: RGWU
Mana cost: 
Steps:
  1. Activate Bjorna by tapping it and sacrificing Cathodion, targeting any creature.
  2. Cathodion dies, adding {C}{C}{C}.
  3. Activate Othelm by paying {2} and tapping it, returning Cathodion from your graveyard to the battlefield.
  4. Cathodion 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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