How can you create a combo with Razorkin Needlehead, Echo of Eons, Grafted Exoskeleton?
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[START OF COMBO]This combo can be formed with Razorkin Needlehead, Echo of Eons, Grafted Exoskeleton

Color identity: UR
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. Razorkin Needlehead 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:
  - Razorkin Needlehead must be on the battlefield
  - Echo of Eons must be in your hand
  - Grafted Exoskeleton must be on the battlefield
  - Grafted Exoskeleton attached to Razorkin Needlehead.
[END OF COMBO PREREQUISITES]
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