Curse Necrofear

As you cast this spell, you can shuffle creature
spells you own in exile that are either white or black
into your deck. Each card shuffled in this way pays
for {1}.

Whenever Curse Necrofear dies because of a spell
an opponent controlled: put Curse Necrofear onto
your battlefield, then destroy X non-land
permanents, where X is the number of
enchantments you control.