Bob, Master of Crows

Whenever Bob deals damage to a creature put a
1/1 flying blue crow token into play under your control.
•{b}{b}{t}: Sacrifice 10 crows, exile Bob and return
him into play transformed under your control.
•{u}{r}{t}: Bob deals 1 damage to target creature.
•{r}{g}{ut}: Populate
"Fear...while it works your mind, it feeds my desires."
Bob the Scarecrow