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

Color identity: WUB
Mana cost: {3}
Steps:
  1. Activate Phyrexian Altar by sacrificing Nevinyrral, adding {1}.
  2. When Nevinyrral dies, its second ability and Nim Deathmantle trigger.
  3. Resolve the Nevinyrral trigger, choosing not to pay.
  4. Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Nevinyrral to the battlefield from your graveyard, and attach Nim Deathmantle to it.
  5. When Nevinyrral enters the battlefield, its first ability triggers, creating a tapped 2/2 Zombie creature token for each creature that has died this turn.
  6. Activate Phyrexian Altar three times by sacrificing three Zombie tokens, adding {3}.
  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:
  - All permanants must be on the battlefield
  - At least two creatures have died this turn.
[END OF COMBO PREREQUISITES]
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