How can you create a combo with Ulamog's Dreadsire, Thornbite Staff, Yahenni, Undying Partisan?
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[START OF COMBO]This combo can be formed with Ulamog's Dreadsire, Thornbite Staff, Yahenni, Undying Partisan

Color identity: B
Mana cost: 
Steps:
  1. Activate Ulamog's Dreadsire by tapping it, creating a 10/10 Eldrazi creature tokens.
  2. Activate Yahenni by sacrificing the Eldrazi token.
  3. When the Eldrazi token dies, Ulamog's Dreadsire triggers, untapping Ulamog's Dreadsire.
  4. Resolve the Yahenni ability.
  5. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Thornbite Staff attached to Ulamog's Dreadsire.
  - Ulamog's Dreadsire does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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