How can you create a combo with Nevinyrral, Urborg Tyrant, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Nevinyrral, Urborg Tyrant, Phyrexian Altar

Color identity: WUB
Mana cost: {3}{W}{U}{B}, plus additional mana dependent on how many creatures have died this turn and commander tax
Steps:
  1. Cast Nevinyrral by paying {3}{W}{U}{B} plus commander tax.
  2. Nevinyrral enters the battlefield.
  3. In response, activate Phyrexian Altar by sacrificing Nevinyrral, adding {1}.
  4. Decline to pay for Nevinyrral's leave the battlefield trigger.
  5. Resolve Nevinyrral's ETB trigger, creating a tapped 2/2 Zombie creature token for each creature that died this turn.
  6. Activate Phyrexian Altar by sacrificing all Zombie tokens, adding {1} for each.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite tapped creature tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Nevinyrral, Urborg Tyrant must be in the command zone
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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