How can you create a combo with Ashnod the Uncaring, Apprentice Necromancer, Basal Thrull?
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[START OF COMBO]This combo can be formed with Ashnod the Uncaring, Apprentice Necromancer, Basal Thrull

Color identity: UBR
Mana cost: 
Steps:
  1. Activate Basal Thrull by tapping and sacrificing it, adding {B}{B}.
  2. Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting Basal Thrull.
  3. Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
  4. Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and Basal Thrull from your graveyard to the battlefield, and giving them haste until end of turn.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite black mana
  - 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
  - Basal Thrull and Apprentice Necromancer do not have summoning sickness.
[END OF COMBO PREREQUISITES]
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