How can you create a combo with Elbrus, the Binding Blade // Withengar Unbound, Walking Ballista, Agatha's Soul Cauldron, Triumph of the Hordes?
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[START OF COMBO]This combo can be formed with Elbrus, the Binding Blade // Withengar Unbound, Walking Ballista, Agatha's Soul Cauldron, Triumph of the Hordes

Color identity: BG
Mana cost: {2}{G}{G}
Steps:
  1. Cast Triumph of the Hordes by paying {2}{G}{G}, giving creatures you control +1/+1, trample and infect until end of turn.
  2. Deal combat damage to an opponent using Withengar Unbound, causing them to get at least ten poison counters.
  3. The opponent loses the game as a state-based action due to having ten or more poison counters.
  4. Withengar Unbound triggers, putting thirteen +1/+1 counters on it.
  5. Activate Withengar Unbound using Walking Ballista's second ability by removing a +1/+1 counter from it, giving an opponent a poison counter.
  6. Repeat step 5 until the opponent loses the game as a state-based action due to having ten or more poison counters.
  7. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Each opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Elbrus, the Binding Blade // Withengar Unbound must be on the battlefield
  - Walking Ballista must be exiled
  - Agatha's Soul Cauldron must be on the battlefield
  - Triumph of the Hordes must be in your hand
  - Elbrus on the battlefield as Withengar Unbound.
  - Withengar Unbound does not have summoning sickness.
  - An opponent cannot block Withengar Unbound, or cannot prevent at least ten trample damage from Withengar Unbound.
  - Walking Ballista exiled by Agatha's Soul Cauldron.
[END OF COMBO PREREQUISITES]
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