How can you create a combo with Zur, Eternal Schemer, Day of the Dragons, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Zur, Eternal Schemer, Day of the Dragons, Phyrexian Altar

Color identity: WUB
Mana cost: {5}{W}{U}{U}{U}
Steps:
  1. Cast Day of the Dragons by paying {4}{U}{U}{U}.
  2. Day of the Dragons enters the battlefield, triggering its first ability.
  3. Holding priority, activate Zur by paying {1}{W}, causing Day of the Dragons to become a 7/7 creature in addition to its other types.
  4. Resolve the Day of the Dragons trigger, exiling all creatures you control and creating that many 5/5 Dragon creature tokens.
  5. Day of the Dragons leaves the battlefield, triggering its second ability.
  6. Holding priority, activate Phyrexian Altar by sacrificing all Dragon tokens, adding at least {2}{W}.
  7. Resolve the Day of the Dragons trigger, causing you to sacrifice all Dragons you control and return all cards exiled by Day of the Dragons to the battlefield.
  8. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Zur, Eternal Schemer must be on the battlefield
  - Day of the Dragons must be in your hand
  - Phyrexian Altar must be on the battlefield
  - You control at least one additional creature.
[END OF COMBO PREREQUISITES]
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