How can you create a combo with Sire of Insanity, Necropotence, Harmless Offering, Teferi, Mage of Zhalfir?
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[START OF COMBO]This combo can be formed with Sire of Insanity, Necropotence, Harmless Offering, Teferi, Mage of Zhalfir

Color identity: UBR
Mana cost: {2}{R}
Steps:
  1. Cast Harmless Offering by paying {2}{R}, giving Necropotence to an opponent.
  2. The opponent skips their draw step due to Necropotence.
  3. The opponent is unable to cast any cards put into their hand from Necropotence due to Teferi only allowing them to cast spells at any time they cast a sorcery.
  4. At the beginning of each end step, Sire of Insanity triggers, causing all players to discard their hands.[END OF COMBO STEPS]

Result:
  - Target opponent skips their draw step[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Sire of Insanity must be on the battlefield
  - Necropotence must be on the battlefield
  - Harmless Offering must be in your hand
  - Teferi, Mage of Zhalfir must be on the battlefield
[END OF COMBO PREREQUISITES]
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