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

Color identity: UBR
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing another nontoken creature, adding {B}.
  2. Activate Apprentice Necromancer by paying {B}, tapping and sacrificing it, targeting any creature card in your graveyard.
  3. Ashnod triggers, copying Apprentice Necromancer's ability, targeting Apprentice Necromancer.
  4. Resolve both Apprentice Necromancer abilities, returning Apprentice Necromancer and another creature from your graveyard to the battlefield, and giving them haste until end of turn.
  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
  - You control another nontoken creature.
  - Apprentice Necromancer does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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