How can you create a combo with Horn of Gondor, Clock of Omens, Encroaching Mycosynth, Phyrexian Altar?
user
[START OF COMBO]This combo can be formed with Horn of Gondor, Clock of Omens, Encroaching Mycosynth, Phyrexian Altar

Color identity: U
Mana cost: {3}
Steps:
  1. Activate Horn of Gondor by paying {3} and tapping it, creating at least four 1/1 Human Soldier creature tokens.
  2. Activate Clock of Omens by tapping two Human Soldiers, untapping Horn of Gondor.
  3. Activate Phyrexian Altar three times by sacrificing three Human Soldiers, adding {3}.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite mana nonland permanents you control can produce
  - Infinite untap of nonland permanents you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least four Humans.
[END OF COMBO PREREQUISITES]
assistant