For example, say your opponent casts Unsummon, trying to return Masterful Ninja from the battlefield to your hand
Blessing of Frost The concept of snow sorceries is pretty cool, and this lets you put +1/+1 counters, distributing any number of counters however you want is actually a fairly powerful ability, especially with certain doubler and adding cards and some creatures that potentially allow you to take turns for adding counters, so I think this does have potential, in the right kind of deck, probably something like Atraxa
WW - Confuse Ray (10) Effect: Flip a coin
Thats more commonly associated with blue cards and red cards, but black has access to Sedgemoor Witch, Fandaniel, Telophoroi Ascian, and Lord of the Nazgl
Legacy of the Duelist, Yu-Gi-Oh