How can you create a combo with Lavinia, Azorius Renegade, Knowledge Pool?
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[START OF COMBO]This combo can be formed with Lavinia, Azorius Renegade, Knowledge Pool

Color identity: WU
Mana cost: 
Steps:
  1. Whenever a player casts a spell from their hand, Knowledge Pool triggers, exiling that spell and allowing them to cast a spell exiled by it without paying its mana cost.
  2. When an opponent casts a spell this way, Lavinia triggers, countering that spell.[END OF COMBO STEPS]

Result:
  - Counter all spells opponents cast that are created by Knowledge Pool
  - Exile all spells players cast from their hands[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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