Knowledge Pool [Mirrodin Besieged] Undead but banish it when this

but banish it when this card leaves the field

Set: Eventide Type: Instant Rarity: Uncommon Cost: {2}{U/R} Creatures your opponents control get -1/-0 until end of turn if {U} was spent to cast this spell

This card cannot attack during the turn it is Summoned

sacrifice Breeding Pit unless you pay {B}{B}

Knowledge Pool [Mirrodin Besieged] Undead but banish it when thisSet: Mirrodin Besieged Type: Artifact Rarity: Rare Cost: {6} 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.