Rending Kraken

If Rending Kraken blocks or becomes blocked, reveal the top 3 cards of your opponent's library and return X target lands (or less if all) to the opponent's hand. X is equal to the number of Red and or Green permanents revealed. Afterward, shuffle your opponent's library.
"There can be nothing more frightening in a gigantic monster with many tentacles than intelligence." --A.E Marling, Dream Storm Sea