Knowledge Pool, Moderation, and Zedruu the Greathearted

Prerequisites

• Knowledge Pool on the battlefield
• Moderation on the battlefield
• Zedruu the Greathearted on the battlefield
• available

Steps

1. Activate Zedruu by paying , 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

Results

• Lock
• Exile all spells target opponent casts from their hand
• Target opponent can only cast one spell per turn