Vexing Bauble, and Knowledge Pool

Prerequisites

• Vexing Bauble on the battlefield
• Knowledge Pool on the battlefield

Steps

1. Whenever a player casts a spell from their hand, Knowledge Pool triggers, exiling the spell and allowing the player to cast another card exiled by Knowledge Pool without paying its mana cost
2. If the player chooses to cast a spell, Vexing Bauble triggers, countering that spell since no mana was spent to cast it

Results

• Counter all spells players cast from their hands