Cast Fractured Identity by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) , exiling Colfenor's Plans and causing each opponent to create a token copy of it.
Whenever an opponent casts a spell from their hand, Knowledge Pool triggers, exiling that spell.
Because Colfenor's Plans 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.