How can you create a combo with Fool's Demise, Mana Echoes, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Fool's Demise, Mana Echoes, Phyrexian Altar

Color identity: UR
Mana cost: {4}
Steps:
  1. Activate Phyrexian Altar by sacrificing the creature with Fool's Demise attached, adding {U}.
  2. The creature dies, triggering Fool's Demise's first and second abilities.
  3. Resolve the first Fool's Demise trigger, returning the creature from your graveyard to the battlefield.
  4. The creature enters the battlefield, triggering Mana Echoes, adding at least {C}{C}{C}{C}{C}.
  5. Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand.
  6. Cast Fool's Demise by paying {4}{U}, attaching it to the creature.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Fool's Demise attached to a nontoken creature that shares a creature type with at least four other creatures currently on the battlefield.
[END OF COMBO PREREQUISITES]
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