Badtime Rabble

Badluck {1}{b}{b} (If this creature would be put into your graveyard from your library, exile it instead. When you do, cast it for its badluck cost or put it into your graveyard.)
{b}, Put tho top of the library on the graveyard: Put a 1/1 Cub Cat token into the battlefield.
Sacrifice an Cat: Badtime Rabble gains +2/+2 until the end of turn