First printed in Mirrodin Besieged (2011)
All 2 prints
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The List (PLST) #MBS-111, 2021
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Mirrodin Besieged (MBS) #111, 2011
Knowledge Pool 
Artifact
Imprint — When this artifact enters, each player exiles the top three cards of their library.
Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with this artifact without paying its mana cost.
Legality
- Legal in
- Modern, Legacy, Vintage, Penny Dreadful, Commander, Duel Commander, PreDH, Oathbreaker
- Not legal in
- Standard, Pioneer, Pauper, Future Standard, Historic, Timeless, Alchemy, Premodern, Old School 93/94, Gladiator, Pauper Commander, Tiny Leaders, Brawl, Standard Brawl, Competitive Brawl
MTGO price: 0.006 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).
Combos
26 combos from Commander Spellbook, the most popular first.
- Opponents can't cast spells, Lock: Drannith Magistrate + Knowledge Pool
- Counter all spells opponents cast that are created by Knowledge Pool, Exile all spells players cast from their hands…: Knowledge Pool + Lavinia, Azorius Renegade
- Exile all spells opponents cast from their hands, Lock: Knowledge Pool + Teferi, Time Raveler
- Exile all spells players cast from their hand, Players can only cast one spell per turn…: Archon of Emeria + Knowledge Pool
- Exile all spells players cast from their hand, Players can only cast one spell per turn…: Knowledge Pool + Rule of Law
- Lock, Exile all noncreature spells players cast from their hand…: Deafening Silence + Knowledge Pool
- Exile all spells players cast from their hand, Players can only cast one spell per turn…: Eidolon of Rhetoric + Knowledge Pool
- Counter all spells players cast from their hands, Lock: Knowledge Pool + Vexing Bauble
- Exile all spells players cast from their hand, Players can't cast noncreature spells exiled by Knowledge Pool…: Knowledge Pool + Soulless Jailer
- Exile all spells opponents cast from their hands, Lock: Knowledge Pool + Teferi, Mage of Zhalfir
