Boromir, Warden of the Tower + Knowledge Pool

Prerequisites

—

Steps

1. 1Whenever 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. 2If the player chooses to cast a spell, Boromir triggers, countering that spell since no mana was spent to cast it.

Effects

• Counter all spells players cast from their hands
• Lock