Shadowmoor is an expansion set released on May 2nd, 2008 for Magic: The Gathering. Shadowmoor is the first set of the new "Shadowmoor" block. This set includes 4 new mechanics; Conspire, Persist, Untap and Wither.
Pretty good creature removal, and you might just nail that key card in your opponent's hand along the way! Not as powerful as the red/black version, but this is still playable in the average control deck.