Mirrodin Besieged (mbs) | ||
| #111 ⸱ Rare ⸱ English | ||
 Variations— Parts— | Knowledge Pool
Imprint — When Knowledge Pool enters the battlefield, 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 Knowledge Pool without paying its mana cost.
LegalitiesNot Legal Standardbrawl Brawl Future Pauper Alchemy Pioneer Historic Standard Gladiator Oldschool Premodern Historicbrawl Paupercommander Explorer Timeless Legal Duel Penny Legacy Modern Vintage Commander Predh Oathbreaker RulingsIf the original spell isn’t exiled (perhaps because it’s countered by another spell or ability before Knowledge Pool’s second triggered ability resolves), the rest of the ability does nothing. The player doesn’t get to cast an exiled card.
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