Elsa, Queen of Winter

: Whenever Elsa, Queen of Winter would leave the battlefield, you may sacrifice a snow permanent. If you do, she phases out instead.
+1: Tap target permanent. It doesn't untap on its controller's next untap step. If it's a nonsnow creature, put a -1/-1 counter on it.
-9: You get an emblem that says, "At the beginning of your upkeep, each opponent loses 2 life unless he or she sacrifices a nonsnow permanent."