Kikaki, Spark Dealer

+1: You may sacrifice a legendary creature. If you do, search your library for a planeswalker and put it onto the battlefield. Shuffle your library.
+1: Gain control of target planeswalker an opponent controls. For as long as you control it, its activated abilities cannot be activated.
-5: Each opponent loses 3 times X life, where X is the number of planeswalkers you control. You gain life equal to the amount of life lost this way.