How can you create a combo with Koll, the Forgemaster, Deathrender, Reckless Barbarian?
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[START OF COMBO]This combo can be formed with Koll, the Forgemaster, Deathrender, Reckless Barbarian

Color identity: RW
Mana cost: 
Steps:
  1. Activate Reckless Barbarian by sacrificing it, adding {R}{R}.
  2. When Reckless Barbarian dies, Koll and Deathrender trigger.
  3. Resolve the Koll trigger, returning Reckless Barbarian from your graveyard to your hand.
  4. Resolve the Deathrender trigger, putting Reckless Barbarian from your hand onto the battlefield and attaching Deathrender to it.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite red mana
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Deahrender attached to Reckless Barbarian.
[END OF COMBO PREREQUISITES]
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