How can you create a combo with Inalla, Archmage Ritualist, Apprentice Necromancer, Mana Echoes, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Inalla, Archmage Ritualist, Apprentice Necromancer, Mana Echoes, Phyrexian Altar

Color identity: UBR
Mana cost: {1}{B}
Steps:
  1. Cast Apprentice Necromancer by paying {1}{B}.
  2. Apprentice Necromancer enters the battlefield, triggering Mana Echoes and Inalla.
  3. Resolve the Mana Echoes trigger, adding at least {C}{C}.
  4. Resolve the Inalla trigger, causing you to pay {1} to create a token copy of Apprentice Necromancer with haste.
  5. The token Apprentice Necromancer enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}.
  6. Activate Phyrexian Altar by sacrificing the nontoken Apprentice Necromancer, adding {B}.
  7. Activate the token Apprentice Necromancer by paying {B}, tapping and sacrificing it, returning the nontoken Apprentice Necromancer from your graveyard to the battlefield with haste.
  8. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Inalla, Archmage Ritualist must be on the battlefield or in the command zone
  - Apprentice Necromancer must be in your hand
  - Mana Echoes must be on the battlefield
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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