How can you create a combo with Urza, Lord High Artificer, Nim Deathmantle, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Urza, Lord High Artificer, Nim Deathmantle, Ashnod's Altar

Color identity: U
Mana cost: 
Steps:
  1. Activate Urza's second ability twice by tapping Nim Deathmantle and Ashnod's Altar, adding {U}{U}.
  2. Activate Ashnod's Altar by sacrificing Urza, adding {C}{C}.
  3. Nim Deathmantle triggers, causing you to pay {4} to return Urza from your graveyard to the battlefield and attach Nim Deathmantle to it.
  4. Urza enters the battlefield, creating a 0/0 Construct artifact creature token with "This creature gets +1/+1 for each artifact you control".
  5. Activate Urza's second ability by tapping the Construct, adding {U}.
  6. Activate Ashnod's Altar by sacrificing the Construct, adding {C}{C}.
  7. Repeat from step 2.
  8. Once you have infinite mana, you may repeat the loop while skipping step 6, resulting in infinite Construct tokens, and you may activate Urza's last ability any number of times.[END OF COMBO STEPS]

Result:
  - Infinite blue mana
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely large Construct tokens
  - Infinite sacrifice triggers
  - Play all cards in your library without paying their mana costs[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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