How can you create a combo with Nekusar, the Mindrazer, Echo of Eons, Corrupted Conscience?
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[START OF COMBO]This combo can be formed with Nekusar, the Mindrazer, Echo of Eons, Corrupted Conscience

Color identity: UBR
Mana cost: {4}{U}{U} if each opponent has three or more poison counters, or {6}{U}{U}{U} otherwise
Steps:
  1. Cast Echo of Eons by paying {4}{U}{U}, causing each player to discard their hands and draw seven cards.
  2. Nekusar triggers for each card your opponents draw.
  3. Resolve the first trigger, causing the opponent to get a poison counter.
  4. If the opponent has ten or more poison counters, they lose the game as a state-based action.
  5. Repeat from step 3 for each remaining trigger.
  6. If needed, cast Echo of Eons from your graveyard for its flashback cost by paying {2}{U}, causing each player to discard their hands and draw seven cards.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Each opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Nekusar, the Mindrazer must be on the battlefield
  - Echo of Eons must be in your hand
  - Corrupted Conscience must be on the battlefield
  - Corrupted Conscience attached to Nekusar.
[END OF COMBO PREREQUISITES]
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