Thats a much trickier question to answer
The OP02 release also gave the game perhaps its most broken Leader: Edward Newgate, also known as Whitebeard
Take a card like Izzet Charm, for example

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For example, Bedlam Reveler will cost RR to cast if you have seven instant and sorcery cards in your graveyard while you control Geist-Fueled Scarecrow