Soulless Jailer + Knowledge Pool

Prerequisites

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Steps

1. 1Whenever a player casts a spell from their hand, Knowledge Pool triggers, exiling the spell and allowing them to cast another nonland card exiled by Knowledge Pool without paying its mana cost.
2. 2Because Soulless Jailer prevents noncreature spells from being cast from exile, no player may cast noncreature spells as permitted by Knowledge Pool.

Effects

• Exile all spells players cast from their hand
• Lock
• Players can't cast noncreature spells exiled by Knowledge Pool