Knowledge Pool, and Curse of Exhaustion

Prerequisites

• Knowledge Pool on the battlefield
• Curse of Exhaustion on the battlefield
• Curse of Exhaustion attached to an opponent

Steps

1. Whenever the opponent with Curse of Exhaustion attached casts a spell from their hand, Knowledge Pool triggers, exiling that spell
2. Because Curse of Exhaustion 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

Results

• Exile all spells cast from target opponent's hand
• Target opponent can only cast one spell per turn