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

Color identity: UBR
Mana cost: {4}{B}
Steps:
  1. Cast Bloodline Necromancer by paying {4}{B}.
  2. When Bloodline Necromancer enters the battlefield, it and Inalla trigger.
  3. Resolve the Bloodline Necromancer's trigger, doing nothing.
  4. Holding priority, activate Phyrexian Altar by sacrificing Bloodline Necromancer, adding {1}.
  5. Resolve the Inalla trigger, causing you to pay {1} to create a token copy of Bloodline Necromancer with haste.
  6. When the token Bloodline Necromancer enters the battlefield, it triggers, returning Bloodline Necromancer from your graveyard to the battlefield.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens with haste
  - 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
  - Bloodline Necromancer must be in your hand
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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