Memory Erosion [Commander 2011]

Set: Commander 2011 Type: Enchantment Rare Cost: {1}{U}{U} Whenever an opponent casts a spell, that player puts the top two cards of their library into their graveyard. "The Filigree Texts do not compel you to act in accordance with their precepts. They only specify the consequences should you fail." —Lodus of the Ethersworn