Knowledge Pool [Mirrodin Besieged]

Description

Set:	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.