How can you create a combo with Knowledge Pool, Moderation, Harmless Offering?
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[START OF COMBO]This combo can be formed with Knowledge Pool, Moderation, Harmless Offering

Color identity: URW
Mana cost: {2}{R}
Steps:
  1. Cast Harmless Offering by paying {2}{R}, giving control of Moderation to an opponent.
  2. Whenever the opponent that controls Moderation casts a spell from their hand, Knowledge Pool triggers, exiling that spell.
  3. Because Moderation prevents the opponent from casting more than one spell each turn, the opponent cannot cast the spell permitted by Knowledge Pool, or any other spell that turn.[END OF COMBO STEPS]

Result:
  - Exile all spells cast from target opponent's hand
  - Target opponent can only cast one spell per turn[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Knowledge Pool must be on the battlefield
  - Moderation must be on the battlefield
  - Harmless Offering must be in your hand
[END OF COMBO PREREQUISITES]
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