The Ratter

{t}{b}Sacrifice target creature you control: draw
the top card of your library, if it is a sorcery you
may cast it immediately at no cost.
A dark legend among the homeless and downtrodden
of Corvaise. It was a creature that subsisted on a
diet of rats, lizards, fish or any other small creatures
it could catch. According to the stories it also craved
larger meals, and would snatch lone children or other
wayward folks and drag them below the city to feast.