Wrexial, the Risen Deep [Commander 2011]

Set: Commander 2011 Type: Legendary Creature — Kraken Rarity: Mythic Cost: {3}{U}{U}{B} Islandwalk, swampwalk (This creature can't be blocked as long as defending player controls an Island or a Swamp.)Whenever Wrexial, the Risen Deep deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.