How can you create a combo with Feldon of the Third Path, Worldgorger Dragon, Mass Hysteria, Heart-Piercer Manticore?
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[START OF COMBO]This combo can be formed with Feldon of the Third Path, Worldgorger Dragon, Mass Hysteria, Heart-Piercer Manticore

Color identity: R
Mana cost: {4}{R}{R}{R}
Steps:
  1. Cast Heart-Piercer Manticore.
  2. When it ETBs, its trigger goes onto the stack.
  3. In response to the trigger, activate Feldon's ability, making a token copy of Worldgorger Dragon.
  4. The token copy of Worldgorger Dragon ETBs, exiling all permanents you control.
  5. Resolve the Heart-Piercer Manticore trigger, sacrificing the token copy of Worldgorger Dragon and dealing 7 damage to any target.
  6. The token Worldgorger Dragon's LTB triggers, returning all permanents you control to the battlefield.
  7. Repeat for infinite damage.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite damage
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite permanent blink
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Feldon of the Third Path must be on the battlefield
  - Worldgorger Dragon must be in the graveyard
  - Mass Hysteria must be on the battlefield
  - Heart-Piercer Manticore must be in your hand
  - At least {3}{R} from sources that ETB untapped.
[END OF COMBO PREREQUISITES]
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